Quattro Trigger Adjustment



Author Topic: Quattro Trigger Adjustment  (Read 790 times))

Offline fredfunk

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Re: Quattro Trigger Adjustment
« Reply #20 on: February 14, 2019, 10:01:35 AM »
Take a dremel to the shoulder of that first screw... go slow and (if you have one) use a die to chase the threads.

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Offline mikeyb

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Re: Quattro Trigger Adjustment
« Reply #21 on: February 15, 2019, 12:01:50 AM »
Jeff,

Your picture was a big help. Worth a thousand words as the wise men say.... Would be even better if it could be simulated/animated!

Again, gracias!

Ahh grasshoppah, you have asked to see a Quattro trigger animation. That request "triggered" my airgun related compulsion to see one also. I have been wanting to do this one and had a little free time today. Too cold to shoot, but time well spent regardless. NO springs, safety, or adjustment screws. Just the basic parts in motion. Best I can do with my current computer and time schedule.

Link to full size animation as it is too large for upload here. https://drive.google.com/open?id=1mYUTK5ZDal4iC0ufrGuyTvlRGo9_C6jn

A single frame is small enough to post below. (edit... added overlay image)
« Last Edit: February 15, 2019, 04:23:55 AM by mikeyb »
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Offline Yogi

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Re: Quattro Trigger Adjustment
« Reply #22 on: February 15, 2019, 01:51:57 AM »
Take a dremel to the shoulder of that first screw... go slow and (if you have one) use a die to chase the threads.



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Offline mikeyb

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Re: Quattro Trigger Adjustment
« Reply #23 on: February 15, 2019, 04:00:27 AM »
Take a dremel to the shoulder of that first screw... go slow and (if you have one) use a die to chase the threads.

Why?

-Y
I think grinding the head/shoulder effectively "lengthens" the first screw. The danger of doing that is the first screw reduces the resting sear overlap (second stage travel) and IF it is adjusted too far in, it will cause a dangerously light hair trigger or possibly a failure to cock. Bump testing is critical here if first screw depth is increased.
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Offline Yogi

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Re: Quattro Trigger Adjustment
« Reply #24 on: February 15, 2019, 12:09:24 PM »
Why not just buy a longer screw?  :-\

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Offline fredfunk

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Re: Quattro Trigger Adjustment
« Reply #25 on: February 15, 2019, 01:28:16 PM »
Why not just buy a longer screw?  :-\

-Y

haha, well why not just buy a Weihrauch HW98!

First, I wanted it to shoot better immediately... not after two day shipping, not after a trip to the store. Sometimes, at 11:00pm in the garage on a cold night you have to just make due with what you have. Second, the factory screw is rounded on the end for smooth sear engagement, so the 'bought' screw would need to be modified anyway for proper function.
Third, as mentioned by mikeyb, this is potentially dangerous modification. I wanted to take no chances that the screw could be turned in too far, so again, any bought screw would need to be cut to length or shimmed with washers.

The bottom line is, I read the posts on tuning the quattro and watched the ellington videos, but in the end, shaving the shoulder worked great for me, took ten minutes of my time, none of my dime. I'm proud of it, and I really hope it helps somebody else down the road.
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My collection:

Daisy 499B
Crosman 1377
Crosman 760
Crosman G1 1911
Benjamin 392
Benjamin marauder .22
Benjamin Prod .22 (with mod)
Benjamin Prod .22
Hatsan Edge .177
Hatsan 135QE

Offline Phoebe

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Re: Quattro Trigger Adjustment
« Reply #26 on: February 18, 2019, 09:13:07 PM »
When you're trying to lengthen a screw by your method, chuck it in a drill press and use a file as a cutter to get a much cleaner job decreasing the thickness of the head. ;)
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