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PostPosted: Thu Jul 28, 2011 10:39 am 
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Joined: Fri Sep 14, 2007 11:50 am
Posts: 91
Location: Perth County, Ontario
Here is another mod if you want an even lighter pull. Move the pivot hole in the transfer bar over .250 inch, and move the pivot pin to the right hole. This will give the transfer bar greater leverage on the sear. You should still be able to adjust sear engagement for a crisp break.


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PostPosted: Sun Sep 25, 2011 1:00 am 
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Joined: Fri Sep 14, 2007 11:50 am
Posts: 91
Location: Perth County, Ontario
I played around with this, and had some trouble with inconsistent velocity due to sear dragging on the hammer. I had to relieve about .025" down, starting just behind where the sear engages when cocked, all the way back off the end of the hammer. This provided enough clearance for the hammer to ride over the sear without dragging. Still has a nice crisp break, and quite a bit lighter.


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PostPosted: Sun Sep 25, 2011 7:39 am 
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Joined: Sat Nov 03, 2007 4:19 pm
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Location: Coalmont BC
The problem with the sear dragging is likely because you had the overtravel adjustment too small.... I had that problem with a couple of my triggers until I figured it out....

Bob

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PostPosted: Sun Sep 25, 2011 10:29 am 
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Location: Perth County, Ontario
Even with no overtravel screw I still had the problem. The problem was due to the fact the break is so light, you wouldn't pull through the trigger quite as hard, so drag problems were still there. I forgot to mention that I relieved the top of the sear forward of the engagment point, at a greater downward angle. Part of the problem is visible in the pic above(non modified sear) the forward part of the sear is actually higher than the rearward part after it breaks,due to the fact the sear rotates away as it breaks, rather than dropping, causing drag. I will post a pic later today of the mod to the sear.


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PostPosted: Sun Sep 25, 2011 3:56 pm 
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Joined: Fri Sep 14, 2007 11:50 am
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Location: Perth County, Ontario
Here is a pic of the modified sear. you can see the greater clearance angle on the top. I found that the angle on the sear and relief on the hammer was key to proper function.
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PostPosted: Thu Jul 11, 2013 12:30 am 
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Joined: Sun Jul 15, 2012 10:49 am
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Location: Victoria, BC and Clarkston, WA
The sear, not the "lever" you modified looks like a stock 2240 sear? I haven't messed with my Discovery, yet!

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PostPosted: Thu Jul 11, 2013 7:55 pm 
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Location: Perth County, Ontario
I wouldn't be surprised it is the same, although I haven't compared side by side. the sear is actually modified in the second pic, look closely at the top of it, just in front of where it contacts the hammer. it has a greater downward angle than in the previous pic. this is to prevent drag with extremely light trigger pulls.


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PostPosted: Thu Jul 11, 2013 8:45 pm 
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Location: Victoria, BC and Clarkston, WA
green machine wrote:
I wouldn't be surprised it is the same, although I haven't compared side by side. the sear is actually modified in the second pic, look closely at the top of it, just in front of where it contacts the hammer. it has a greater downward angle than in the previous pic. this is to prevent drag with extremely light trigger pulls.


Yeah I see you put in a relief angle. Very common on most trigger jobs. Usually I just square that surface on the surface grinder.

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Pardini K10
Brocock Concept .22
3 Custom Crosman 2260
Benjamin Discovery .22 w/Joe Hickey stock!
Crosman 150 pistol .22
4 Crosman MK 1 pistol .22
Mrodair CP-1M .22 and .177


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