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All Springer/NP/PCP Air Gun Discussion General => Machine Shop Talk & AG Parts Machining => Share Your Simple Home Projects (TRICKS-N-TIPS) => Topic started by: Hoosier Daddy on March 19, 2017, 08:14:16 AM
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While rebuilding my Benjiman 312 I had difficulty pulling the valve after the nut was removed using the standard dual purpose tool that comes with the rebuild kit.
(https://www.pyramydair.com/images/acc/PY-A-624_repairkit.jpg)
The valve on mine was really stuck in there and the videos I had watched showed using a separate puller designated for the task.
(http://lh3.ggpht.com/_aNjK3CTQ0DE/TC4tBwoFvQI/AAAAAAAALZU/IQXw8EoG4A4/07021015_thumb.jpg)
Recommendations were to inset a rod, screwdriver,or such thru the hole in the tool and tap it with a hammer to drive it out. I knew I would either hit the brass tube and damage it or tap it to one side and cock the valve in the tube. Really wanted to use a puller of some control and learned the style I had seen with the thumbscrew were hard to come by and the tap the same thread as the valve to make one was expensive... After all, I already had the dual purpose one in hand.
I screwed the tool onto the valve and marked the depth on the tool with a sharpie, then took it on a trip to the hardware store.
I first found a dowel pin that fit the hole in the tool, next 2 fender washers the size of the OD of the tool... I slid the dowel pin in the hole, the a washer, held the other washer at the mark I had drawn to find a length.
Lastly a pair of long nuts and two bolts that when screwed together were almost the same length.
1/4-20's were too long but in the metric section I found 6mm that were just right.
(http://i1327.photobucket.com/albums/u670/Hoosierb17/Hobbies/IMG_20170316_172221325_zpsrlksqxxo.jpg)
While not totally necessary, I used a bit of glue (epoxy) and attached the bolt heads to one washer. Did this so I would not have to hold both the bolt and the nut with wrenches during use.
(http://i1327.photobucket.com/albums/u670/Hoosierb17/Hobbies/IMG_20170318_085450231_zpsdjqvauct.jpg)
Screwed the tool onto the valve, threaded the nuts onto the bolts, slid the washer with the bolts/nuts attached onto the tool, then the second washer and last slid the dowel pin in. Unscrewed the nuts hand tight to take up the slack.
(http://i1327.photobucket.com/albums/u670/Hoosierb17/Hobbies/IMG_20170318_084949545_zpsvzic6ar2.jpg)
Then using a small wrench I turned each nut 1 "flat" at a time, alternating back and forth between the two nuts to gradually expand the distance between the two washers.
(http://i1327.photobucket.com/albums/u670/Hoosierb17/Hobbies/IMG_20170318_085122826_zpslpdtaont.jpg)
The valve began to budge once a little torque was applied and slid smoothly out without any fuss!
Sure made me feel better doing this controlled instead of hitting it with a hammer!
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Very nicely done. A little moisture and a lot of time and those valves get cemented in there.
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Thanks, glad to share. It worked out well in the end, I got it reassembled today.
Nice firm pump action now and...BAM! ;D
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Very creative.
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Hmmmm.... mine came in a kit I ordered from PA. Matter of fact, I think I have a couple of them floating around now.
Nice work tho.