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Air Gun Home Forum Index » Rifles » Disco Velocity Adjuster / De-gasser    View previous topic :: View next topic  Disco Velocity Adjuster / De-gasser   Posted: Wed Feb 25, 2009 12:39 pm rsterne Moderator Joined: 15 Jan 2008 Posts: 2998 Location: Coalmont, BC Scruffie sent me some Disco parts to play with, and I made him up a velocity adjuster and de-gassing tool that will work with it.... Pretty simple for any of you with access to a lathe.... Drill & tap the Crosman rear plug (Part # 1761-012) to 3/8"-16 NC.... Turn down a 1-1/4" long 3/8"-16 NC socket-head SS set-screw for a spring seat and to clear the mounting screws for the rear plug.... Drill & tap the set-screw to 10-32 (I counterbored it from the front end to reduce the threaded length inside to only 3/8").... Remove the threads from half of a 3-1/2" length of 10-32 threaded rod, and put a knob on the end.... This should allow you to adjust the velocity and shape of the shot string over quite a large range.... you can also change out hammer springs without stripping the back of the gun.... A 3/16" allen key will still fit fine in the end of the set-screw for adjusting it.... The lock nut is a SS 3/8"-16 NC "jam" nut.... The knob for the de-gasser is made from a 1/8" pipe plug.... To use the de-gassing tool, make sure the hammer is forward, then insert the rod into the set-screw and thread it in until it rests against the inside of the hammer.... Turn it in slowly until the air (or CO2) inside the main tube is vented through the transfer port and barrel.... Thanks, Scruffie, for the loan of the parts.... wish I had taken you up on the loan of the Disco.... .... Let us know how it works out.... Now if I just had a PCP pump for my next project.... Bob _________________ Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since! Airsonal: Too many to count!   Posted: Fri Feb 27, 2009 1:39 am kanyon Silver Status Member Joined: 09 Aug 2008 Posts: 1582 Location: New Zealand Looks pretty kool...nothing better than realy playing with things. Ok how dose it work I have no idea how a disco works. I asume it restricts the hammer travel?   Posted: Fri Feb 27, 2009 11:04 am rsterne Moderator Joined: 15 Jan 2008 Posts: 2998 Location: Coalmont, BC The adjuster works by changing the preload on the hammer spring.... The de-gasser pushes the hammer forward to open the valve and let the air / CO2 out if you need to.... You can't have the de-gasser in place when using the gun.... Bob _________________ Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since! Airsonal: Too many to count! Disco Velocity Adjuster / De-gasser     Air Gun Home Forum Index » Rifles 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." Your browser cookies have been reset or you need to register to access the topic in question. Use the 'Register' button near the top left of this page. Click Here for AirGunHome.com Main Page Powered by phpBB © 2001-2004 phpBB Group Partial Styling Supplied by Vjacheslav Trushkin Themes Database.