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 Post subject: BT65 Info/Repair.
PostPosted: Sat Dec 28, 2013 7:35 pm 
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Joined: Fri Sep 09, 2011 11:30 pm
Posts: 190
Location: Edmonton
Hatsan BT65 Rear Bolt.
I've been having issues with the rotary mag not indexing properly, so, I took it apart.
Upon dis-assembly, I found a part that was bent. It is kind of "Y" shaped, looks like a tuning fork. In the parts diagram, (sorry, don't know how to post the link) it's #661-Hammer sear. One of the "legs" was bent against the other one.

The rifle was working with it bent. It also works with it straight and also without it. I can see how it interacts with the bolt, but not with the hammer. I don't understand the purpose of this part and I'm in need of enlightenment before I can continue.

Thank you for your time.

Max


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 Post subject: Re: BT65 Info/Repair.
PostPosted: Sat Dec 28, 2013 11:09 pm 
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Joined: Mon Sep 05, 2005 10:55 pm
Posts: 6845
Location: Rocky Mtn Hse Alberta
Max, that piece is called the antiknock which is a hammer debouncer
When the bolt is forward the fork is spring loaded waiting for the hammer to drive forward. The fork then drops behind the hammer stopping any rebound.
Your gun will function fine without it but may be less efficient.
Cheers
Walter....

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 Post subject: Re: BT65 Info/Repair.
PostPosted: Sun Dec 29, 2013 6:42 pm 
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Joined: Fri Sep 09, 2011 11:30 pm
Posts: 190
Location: Edmonton
Thank you Walter.
It makes perfect sense now.

As for efficiency, I already made and installed a sail as well as plugged 5 holes and filled the groove with JB Weld. With the extra force applied upon the sail, would that prevent the hammer from cracking the valve opened on the bounce back?

That part looks pretty flimsy and maybe more trouble than it's worth?

Max


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 Post subject: Re: BT65 Info/Repair.
PostPosted: Sun Dec 29, 2013 9:00 pm 
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Joined: Mon Sep 05, 2005 10:55 pm
Posts: 6845
Location: Rocky Mtn Hse Alberta
Shoot it without the fork for a while and see how it does. The sail only exerts a force to close when the valve is open and flowing. It shouldn't affect the bounce so you may lose shots per fill but the gain will offset the loss. Go for it! :-)

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