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Author Topic: Very tight bolt on closing my new 392S right from factory unless retainer screws  (Read 121 times))

Offline Tallbald

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Excited to have, and pleased with the construction of my new 392S. Keeps my beautiful wood stock 392PA from being lonely.
 Arrived right from the factory. However when turning the bolt handle down to lock into battery, the handle is very tight. Tightening as it goes farther down to full close. I removed the bolt to look for burrs (none) and applied a couple drops of Pellgun oil but the only way to make the bolt handle close snugly, firmly and without any grinding feeling was to remove the two retaining screws holding the cam plate and cover plate. Using blue Loctite I reinserted them and just lightly screwed them in. Thing is, with time the cam plate could loosen and cause air loss on firing. I suspect that the two screws, when snugged down too much, protrude through into the receiver and bind the bolt.
 The cover plate is a thin stamping that was a little flexed from the factory tightening so if it was meant to function as a tensioner to keep tension on the two screws it's not doing it. I'll remove the bolt again to see if the steel screws scratched the bolt as it rotates into locked position. Sure hop not.
 So. Would very small washers stacked under the screws, reinforced with blue Loctite , and firmly tightened down work to prevent cam plate movement and bolt binding when the optimum thickness is found?
Thoughts sure appreciated and thanks.
Don
  • ..Kentucky
"All my air guns are LCPs, or "locally charged pneumatics" using the hand operated compressor built into each one in a crafty engineering manner". Don

Diana .177 34 Classic rifle
Diana 460 .22
Benjamin 392, .22 pumper rifle
Crosman H9A .22 pumper pistol
Ruger .177 springer pistol from my loving wife
Benjamin Franklin 347, .177 rifle circa 1976

Offline fivestar45

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What you might want to try is check the bolt operation with the lug bolt left out and the cam plate and cover screwed down If the problem is still there back the screws out one turn. If this improves things just shorten the screws by just grinding a few thou's off their ends.

Offline Tallbald

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Excellent approach and thank you. Very very good diagnostic approach. Do hope the bolt isn't damaged.
 I'll have to wait for some time though. Yesterday I had right shoulder rotator cuff repair surgery, open incision. Two ripped- through tendons. Feels like an unset fresh broken bone and the sling gets in my way. No pumping either of course.
Thanks again. Don
  • ..Kentucky
"All my air guns are LCPs, or "locally charged pneumatics" using the hand operated compressor built into each one in a crafty engineering manner". Don

Diana .177 34 Classic rifle
Diana 460 .22
Benjamin 392, .22 pumper rifle
Crosman H9A .22 pumper pistol
Ruger .177 springer pistol from my loving wife
Benjamin Franklin 347, .177 rifle circa 1976

Offline longhunter

  • what if we removed all the warning labels, and let nature take it's course?
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Sounds to me like the cam plate was adjusted too far forward.
  • casco, wi. USA
'87 Diana 48 .177
crosman model 1 first varient
Benjamin NP pistol
Beeman P17 
Crosman 140
Diana K98
Crosman 1322 Medalist
Benjamin 310 (early)
Crosman 2100

Offline Tallbald

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Thank  you both. Yesterday I did remove the cam lug bolt , while leaving the plate(s) screwed in place. The bolt still did bind. Unable right now because of surgery to shorten the screws, I found the thinnest brass washers I have on hand. They measure 0.023 inch thick. I installed them under the plate screws and adjusted the bolt handle downward operation per procedure. Upon tightening the plate screws the bolt snugly but smoothly lowered into place. Always cautious tightening steel into brass I decided to use a breath of blue Loctite on the plate screws too. For right now, I'm satisfied. Thanks again to you both.
Don
  • ..Kentucky
"All my air guns are LCPs, or "locally charged pneumatics" using the hand operated compressor built into each one in a crafty engineering manner". Don

Diana .177 34 Classic rifle
Diana 460 .22
Benjamin 392, .22 pumper rifle
Crosman H9A .22 pumper pistol
Ruger .177 springer pistol from my loving wife
Benjamin Franklin 347, .177 rifle circa 1976

Offline longhunter

  • what if we removed all the warning labels, and let nature take it's course?
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  • GTA Senior Contributor
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Glad you got it fixed.
  • casco, wi. USA
'87 Diana 48 .177
crosman model 1 first varient
Benjamin NP pistol
Beeman P17 
Crosman 140
Diana K98
Crosman 1322 Medalist
Benjamin 310 (early)
Crosman 2100

Offline Tallbald

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My fixing this, as well as any other issue I've ever run up against in the air gun hobby, is a result of good folks like you all and your all's willingness to teach, share and encourage lesser experienced and educated folks. Without men and women like you all I'd be blindly flailing to correct problems as they arise, and ignoring through poor insight, the incipient problems.
Thank you all again.
Don
  • ..Kentucky
"All my air guns are LCPs, or "locally charged pneumatics" using the hand operated compressor built into each one in a crafty engineering manner". Don

Diana .177 34 Classic rifle
Diana 460 .22
Benjamin 392, .22 pumper rifle
Crosman H9A .22 pumper pistol
Ruger .177 springer pistol from my loving wife
Benjamin Franklin 347, .177 rifle circa 1976