Groove Cutter
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CO2 Pistol Valve Groove Cutter
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I planned to modify my CO2 pistol, the Gletcher Tokarev TT-33, just like in the YouTube video by “turbo15100”
https://youtu.be/5mxtcdcXctg?si=shZXnqy235DTlYci
He used a Dremel to cut the groove for the O-ring on the valve. That’s quick, but it looks pretty rough.
Since I didn’t have a lathe to make it neater, I needed an alternative. Using this holder for a key file, you can file a clean groove into the valve, though unfortunately it takes a lot of time and effort. It takes many turns and you have to press the file in with force. Clean it from time to time. It’s also important to use a new file; mine was already quite old. Afterward, just deburr the groove with sandpaper and insert a suitable O-ring. I made the groove 1 mm deep and used an 8 mm O-ring.
The return spring also needs to be replaced. For this, I ordered the 0.8mm x 150mm x 15mm springs from the “Seiko Hardware Store” on AliExpress. You might also want to order the 100mm length and test which one has sufficient tension.
Then lubricate everything properly, including the O-ring, and reassemble.