GTA
PCP - HPA - C02 Gate => Crosman Discovery Forum => : melloroadman April 24, 2008, 01:55:31 PM
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Can any one tell me how long the threaded portion of the degassing tool is from the back of the plastic nob to the end of the threads as well as the cost .Marvin
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Just get a 10/32 screw of perhaps 1.5" and it will work for you.
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How do you use it???
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I don't know if the above thread will work with out the milled down end . You can see the tool in use on the crossman site under the discovery demo review .I wanted the specs of it to make a power adjuster out of part of it. But today at OHC I found a nice little black nob with a 10 X 32 thread and a long 10 X 32 screw that I can cut to fit to make the power adjuster out of when time permits. Try this sit Marvin
http://www.crosman.com/site/catalog/crosman/rifle/pcp
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I've done the power adjuster thing. Not much to it, you need the screw and a spring guide. The degasser passes through the spring to the hammer, and pushes the hammer in against the valve stem to open it. The 10/32 screw will fit through the spring no problem, that's why you need to make a spring guide for a power adjuster. I think I used a 1 1/2" (?) 10/32 brass thumbscrew that I found in my parts box and I made the guide from a nylon bolt from Home Depot. Turned it down with a drill and dremel. I've tried a bunch of different springs, ended up cutting down the original about 1/4". There isn't much clearance when the gun is cocked, the spring is almost fully compressed already. I recall less than 1/4" of play and some of that is lost to the spring guide, thus the need for a shorter or a lighter (thinner wire) spring.
I also put in an HDD from Big Ed (good investment, I count about 20% shot increase).
Out of the box, mine was shooting right around 800fps with Crosman 14,3's. Mine is an early serial number, I understand the newer guns have been somewhat improved. Tested last night, .22 shooting 14.3 Crosman's: on low, from 2000 to 900psi, started out in 550's, topped at 705, I stopped at 650's after 99 shots! On high, from 2000 - 1100psi, pretty flat 850 - 860 for 17 shots, then a quick drop to 800 in ten more shots. Also, the gun is VERY quiet on low power, especially below 650 fps. Sounds like a .22 CB on high.
Personally, I'm happy with the results but it took a lot of fooling around with guides and springs to get a decent result. Had the gun apart dozens of times over many hours. I think if I get another Disco I'll just buy an adjuster.
jeff124
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Thanks for the info it might save me some work but I think I will try and make my own and save some cash . I will probable end up with two different springs any way. One to pump it up just a little for 50 yards in the summer and one to turn it down for indoor 16 yards in the fall and winter. When I talked to Roy at Mountain Air it sounded like he would have to supply me with to springs to achieve the same benefit as well. But I am open to suggestions. Marvin