Canadian Airgun Forum

Ok guys I picked up a few airguns at the gunshow on sunday and I need help with one. It's a chinese break barrel model Tl820 700fps from 60's-70's maybe even a little earlier. It sounded a little dry when I shot it so I opened it up and guess what I found in the compression tube...... any guesses? I found half a nail and a pin!!! They both scratched the litter out of the compression tube and made so many burs and uneven spots it wasn't even funny. The leather seal was all hard so I soaked it in oil over night with not much luck I'm lucky the nail and pin didn't wreck it. I filed the burs out of the compression tube as best I could. But what I need is a new piston seal that goes on the front of the piston. Since it's made of leather is there a way of making a new one or getting one somewhere? The piston seal is the same size as the CZ 630/631 piston seal but i'm not ready to put one in as this chinese springer has a lot of piston slam which would wreck the CZ piston seal. So any seals out their that would fit this odd chinese break barrel and that would be durable? Thanks for any input.

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ONE SHOT, ONE KILL

Go see a shoe-maker for your leather seal.My slavia add a seal leather and the shoe -maker made me one and i have good result whit that.
pascal

I never thought of that. thanks. I will try that this weekend.

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ONE SHOT, ONE KILL

I wonder if a brake cylinder hone (auto parts store) would work to clean up the burrs in the compession tube? You would have to be very careful not to pull it out far enough that it would catch in the cocking leaver grove.

I replaced the leather seal in my Telly with an "O" ring type piston. It seems to work well but I have only fired a couple of shots out of it. I don't know durable it will be.

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Come and visit ..Doctor Frankenguns Airgun Forum..

I thought of maybe getting a hone. It would probably work too. O-ring type piston seal you mean rubber?

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ONE SHOT, ONE KILL

Cheaper and easier than getting a hone. . .

You need a drill, preferably cordless, a plastic coat hanger or piece of wooden dowel, 400, 600, 800 and 1200 grit wet/dry sandpaper.

Cut the long side off of the coathanger and chuck it in your drill. Tape a strip of medium grit (ie. 400) sandpaper to the coathanger. Wrap the stirp of sandpaper around the rod and insert it into the tube to be honed. Lubricate with lots of water and spin (push it in and pull it out to evenly sand the entire bore) until you are bored. Then switch to 600, 800 and finally 1200 grit (if you really want to go that fine). You can finish it off by polishing with toothepaste on a rag, on the stick (whitening toothepastes generally contain diatomaceous earth (the silicate shells of diatoms) and make very good polishing compounds).

This concludes my polishing a bore tip for the day.

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Fiat Lux

PM me for FTP/valve combos, RVAs, DPHs and assorted brass accents

I'm gonna try that. thanks man.

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ONE SHOT, ONE KILL

I should have taken photos of it

The leather cup was about 1/4" wide so I removed it and installed a brass piston 1/4" wide with one ring groove in the center of it. Slipped on the "O" ring and put it back together.

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Come and visit ..Doctor Frankenguns Airgun Forum..

That makes sense. It should work as long as the o-ring seals properly. One way to find out is pick a day where you have a lot of time on your hands and shoot the rifle like 100 times or more and then take it apart and inspect it see if the o-ring held up.

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ONE SHOT, ONE KILL

A lot of time on my hands I haven't had that problem (or luxury ) since I was 14.

If I knew someone with teenage kids I would lone it out for a week and give then a couple of cans of pellets. As long as it shoots good I won't take it apart.

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Come and visit ..Doctor Frankenguns Airgun Forum..

As to ustilago's suggestion of polishing it I would have to disagree. Just like in an engine you want a minute amount of lubricant to stay on the chamber wall. By polishing it there's so little lube left that it wears the piston out.

I would recommend honing up to 600 grit at the most and going up and down quickly to create a good cross-hatch (XXXX) pattern.

Well it's too late now I just followed ustilago's advice and it worked out great!!!

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ONE SHOT, ONE KILL