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 Post subject: scope issue fixed
PostPosted: Tue Mar 17, 2015 9:26 am 
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Joined: Sun Jan 09, 2011 8:07 am
Posts: 3320
Location: Central West River Nova Scotia
I was having an issue with my leapers utg mounted on my Diana 34 as mentioned in Huck,s post. I was running out of windage clicks. I tried shimming, but couldn't get enough shims in to make a difference. I tried different configurations, front to back, opposite side clamping and shimming. None seemed to help. Only a small improvement. Then I noticed my rings were set at the widest point on the scope. One close to the bell, the other closest to the eye piece. At that distance apart, any shim would make little difference. So I put the rings closer to the turrets, now only about 2 inches apart. A single shim almost brought the crosshairs perfectly inline with poi with the scope centered . Actually 3 clicks past center.
So the closer your scope rings are together, the less shims needed . This also applies to elevation. Simple geometry really, I just didn't think of it, since I normally keep my rings close to the turets anyway. This was the only time I mounted the scope with the rings far apart. I hope this might help others who may have windage or elevation issues.

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 Post subject: Re: scope issue fixed
PostPosted: Tue Mar 17, 2015 9:31 am 
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Location: Ontario, Canada
Great tip Joe..... Thanks


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 Post subject: Re: scope issue fixed
PostPosted: Tue Mar 17, 2015 9:53 am 
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makes sense, glad you got it resolved Joe.. :wink:

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 Post subject: Re: scope issue fixed
PostPosted: Tue Mar 17, 2015 2:14 pm 
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Joined: Sun May 04, 2014 1:56 pm
Posts: 215
Location: British Columbia
You might want to figure out what the underlying issue is instead of putting a band-aid on it. Just a suggestion.


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 Post subject: Re: scope issue fixed
PostPosted: Tue Mar 17, 2015 2:38 pm 
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Thumbs up!

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 Post subject: Re: scope issue fixed
PostPosted: Tue Mar 17, 2015 2:49 pm 
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Joined: Thu Feb 02, 2006 11:35 pm
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Location: Alberta Canada
Sounds like either better rings required or try lapping the rings you have.
Home made lap can be made for 1" rings from 1" dowel with some 600 or finer grit, wet sand paper glued upon the dowel. Use a cream type aluminum polish as you lubricant. Personal fav is Autosol. Did lots years ago this way until I got a Wheeler lapping kit. 30mm rings can be done by layering up your paper glued together.
Just throwing it there for you budget minded do-it-selfer, types...Lots of U tube instructionals out there.

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 Post subject: Re: scope issue fixed
PostPosted: Tue Mar 17, 2015 3:41 pm 
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Location: Central West River Nova Scotia
ratdoctor wrote:
You might want to figure out what the underlying issue is instead of putting a band-aid on it. Just a suggestion.

From a simple look down the length of the gun, the barrel seems to be angled to the right which is the side I'm running out of windage adjustment. The barrel assembly is very well fitted in the pivot pin. No movement or flop of any kind. I considered bending the barrel to align it better, but dont really want to mess with it for fear of changing the accuracy. Since I have the scope mechanically centered and I'm getting great groups. I'll just leave it set firmly where it is and not mess with it anymore. Also there is a chance that it might be perfectly straight and only "looks" out of alignment. An optical illusion if you will.

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 Post subject: Re: scope issue fixed
PostPosted: Tue Mar 17, 2015 5:08 pm 
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Location: British Columbia
Pretty easy to measure. Just remove the barrel and lay it flat on a granite or steel table that is perfectly flat. Flip it over and see if the end of the barrel sits higher one way or the other. If yes, stick in padded vice and tweak in direction needed. Pretty easy. You're barrel can be shaped like an "S" it won't affect accuracy as long as the muzzle is in the right place. Fixed many a cheap chinese break barrel that way.


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 Post subject: Re: scope issue fixed
PostPosted: Tue Mar 17, 2015 5:52 pm 
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Location: Central West River Nova Scotia
ratdoctor wrote:
Pretty easy to measure. Just remove the barrel and lay it flat on a granite or steel table that is perfectly flat. Flip it over and see if the end of the barrel sits higher one way or the other. If yes, stick in padded vice and tweak in direction needed. Pretty easy. You're barrel can be shaped like an "S" it won't affect accuracy as long as the muzzle is in the right place. Fixed many a cheap chinese break barrel that way.

I've done that on other guns with no negative results, however in this case the barrel seems to lean to one side right from the pivot pin.

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 Post subject: Re: scope issue fixed
PostPosted: Thu Apr 02, 2015 2:59 am 
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Joined: Mon Sep 03, 2007 7:56 pm
Posts: 173
Location: Sidney, BC.
Sounds like a poorly machined main tube...KEN.


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 Post subject: Re: scope issue fixed
PostPosted: Thu Apr 02, 2015 1:35 pm 
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Joined: Sun Jan 29, 2012 7:31 pm
Posts: 696
Location: Halifax, NS
Of course I am talking out of my league :oops: ... you guys are way more experienced.

Have the forks of the comp tube been checked for alignment I wonder. If forks are good then placing a slightly thicker washer on the right side of the barrel block
inside the fork will allow for some correction. If barrel is all bent out of shape right from the block .. I think you may be able to remove it from the block, but not sure of the RWS 34.
Probably a small pin holding the barrel after friction fit, with epoxy for good measure. Removal may not be that hard & you may be able to bend to correct right from the few inches
that reside in the block.
As for scope mounting, bases/rings etc. I always try & mount any scope with rings placed as far away from turrets & bells ie; ideally in the middle of the scope tube in between the bells & turrets.
This lends to more metal for any shock/vibration to travel through to get to the lenses or turrets. Rings that are too close to the bells allow for immidiate shock right to the lenses, shaking them loose
a lot quicker than they would have (if they would have at all) Too close to turrets & reliability of the "clicks" suffers. May may not be able to "walk the scope" when otherwise you could.
For *inexpensive springers* I've shimmed a few & lapped a couple mounts/rings, always found it is best to get barrel-comp tube alignment sorted, at times comp tube is not even
sitting level in the stock! When shimming is a 'have to' using a single thick shim in each ring is always better than inserting multiple shims per ring.
Thin leather works out well, (can be sanded down as well) doesn't' mar the tube & offers some relief against kinking the tube while offering a better grip than tape or plastic- further negating use of extra torque.
I've used the tounge from the inside of an old leather shoe...sanded to fit. Worked out really well.
Should any of this sound ill logical or technically unsound I am sure I'll learn from y'all.

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 Post subject: Re: scope issue fixed
PostPosted: Thu Apr 02, 2015 4:09 pm 
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Joined: Sun Jan 09, 2011 8:07 am
Posts: 3320
Location: Central West River Nova Scotia
Well firstly leather would probably expand and contract with humidity levels. Also compaction over time will or may cause changes to poi . Thin plastec is non compactable and non absorbent of moisture.
As for the gun, its a Diana 34 so the fit of the barrel is quite exact. No room for a shim of any kind at the pivot point. I know bending the barrel slightly would work, but as I have everything sighted in well now, I would rather not mess with it.
The same solution could be used for barrel droop, but instead a compensating mount was invented, most likely because bending a barrel for any reason is a last resort for the user.

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