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Air Gun Home Forum Index » General Air Gun Questions and Topics » Thrust washer stack for less hold sensitivity.    View previous topic :: View next topic  Thrust washer stack for less hold sensitivity.   Posted: Sun May 11, 2008 10:28 pm cw Banned Joined: 10 Feb 2008 Posts: 1771 rtgfrdgrf Last edited by cw on Fri Jan 23, 2009 3:09 pm; edited 1 time in total Washer stack?!?!?   Posted: Mon May 12, 2008 12:54 am cliffspot Veteran Member Joined: 15 Jun 2007 Posts: 132 Location: Miami via Hawaii Would it work if you put the washers in the piston? And wouldn't this increase the velocity a bit? I don't understand how this would affect the hold sensitivity of the gun. Enlighten me please! _________________ There are no accidents; only ignorance, mechanical failure, and acts of God! I have loaded over 6 million rounds in the last 5 years and STILL have not seen it all!   Posted: Mon May 12, 2008 9:21 am cw Banned Joined: 10 Feb 2008 Posts: 1771 When a coil spring in an airgun expands (and contracts), the ends rotate in oppisite directions. Hold sensitivity occures if the spring ends are not alowed to rotate freely. Then the ends of the spring will gain traction and twist the gun to varying degrees each time that it is shot. The thrust washers enable the spring ends to rotate freely. When I fist acquired my Patriot, it's recoil was plagued with a very harsh twist to the right. Installing a thrust washer stack all but eliminated it. I eventually had to install a gas spring to completely eliminate it. The stack in the photos were installed in a .22 B26-2. It was not really all that hold sensitive to begin with, but became more so after a Maccari HP spring and tesla seal were installed. The washer stack eliminated it. CW Last edited by cw on Thu May 15, 2008 12:02 pm; edited 2 times in total   Posted: Mon May 12, 2008 9:31 am cw Banned Joined: 10 Feb 2008 Posts: 1771 Sometimes adding weight to the piston will increase power by lessening piston bounce at the end of the stroke and making the piston dwell at the transfer port longer. But this was not the case with this BAM. I added 7 grams when I first got it and power went down. This is why there is an ounce and a half weight in the piston of OEM Patriots. The weight is removed when the gas spring is installed. This also gives it a way faster lock time than an OEM Patriot. CW   Posted: Mon May 12, 2008 8:02 pm 2RCHA Veteran Member Joined: 21 Feb 2007 Posts: 195 Location: The Big Smoke, Ontario http://www.network54.com/Forum/113813/message/1210297518/Mine+shoots+in+the+550-560+range%2C%2C%2C%2C%2C%2C%2C%2C%2C%2C%2C%2C%2C Check the link above,,Doc Frankengun uses this setup on his B4, seem's to do a great job at letting the spring move freely, and reset itself. I just changed the spring in my .22 B4 today,,I wish I would of remembered this before I put everything back together. Oh well, I may be changing this spring for a Quest 1000 spring this summer, I think I'll try this setup next time I have the gun apart. Cheer's, Andy. _________________ QB78-D w/Fitco 4-16x44CE 2x,XS B4-2a .177/.22 w/Fitco 3-9x40 XS B2-2a .22 w/Simmons 3-9x40 XS B9-1 w/AimPoint CompM2 TAC1 Extreme w/Tasco 3-9x40/Var,. Kit 2240/2289g w/Fitco 3-12x40K-GD Gamo Recon w/ Fitco 2-7x32k QB-57Deluxe .22 w/Fitco 2-7x32k   Posted: Wed May 14, 2008 6:51 pm Roy Veteran Member Joined: 01 May 2008 Posts: 129 Location: Wisconsin My R9(HW95) has always had a little "twist" upon shooting, so I am going to try the stacked washer bearings. How thick can the stack be before the spring bottoms out ? And, would it help to also smooth and polish the spring ends ? Roy   Posted: Thu May 15, 2008 6:57 am cw Banned Joined: 10 Feb 2008 Posts: 1771 Polishing the spring ends can help, sometimes, a lot. The only limit that I have run into is if too many washers are added the piston cannot travel far enough back to engage the sear and the gun will not cock. Make sure to lap the washers to each other or they might not turn freely. CW Thrust washer stack for less hold sensitivity.     Air Gun Home Forum Index » General Air Gun Questions and Topics You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum All times are GMT - 5 Hours   Page 1 of 1   All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First  Select a forum Main Forums----------------AirGunHome Q&AGeneral Air Gun Questions and TopicsPicture GalleryTarget Shooting: Casual, Fun and CompetitionHunting, Pest Control, Varminting People/Events/Airgun Issue Discussion----------------Introduce YourselfThe BS TopicClubs/Events/Regional/Political Airgun Issues Maintenance, Modification and Reviews----------------RiflesPistolsAntique, Collector and Novelty AirgunsBB GunsPellets/AmmoOpticsAccessoriesAirgun Smithing Buy, Sell or Trade Forums----------------For SaleWant to Buy   Note: If you are seeing "Please enter your username and password to log in." 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