Well now - here's some REALLY BAD advice.....

[leonardj]

Just when you think you've seen it all with regards to bad advice on the internet, we now have this little tidbit out there endorsing an ages old method of screwing up perfectly good airguns.
ht tp://www.pyramydair.com/blog/2013/08/neat-fix-for-bulk-fill-co2-guns/

If you read the text carefully, he is not suggesting the use of automatic transmission fluid, but rather, the use of an automatic transmission concentrated sealer - designed specifically to soften and swell the seals. Perhaps a look at what the eventual outcome of such shoddy practice does inside your airgun is in order. The following excerpt is from a post that I made just the other day, dealing with "Attention to Detail":

Next comes the "lazy man's reseal" - spraying a solvent into the gun to "soften up" the seals and cause them to seal again - at least temporarily - until they completely turn to mush.
This S&W 77A valve shows just how far the liquified rubber o-ring seal migrated along the valve body as a result of this method of "re-seal".

Even urethane o-ring seals are not immune to turning to mush when exposed to the right solvent, as seen on this S&W 78G valve.

This valve stem seal expanded to well over four times it's original size, due to some unknown solvent being introduced into the gun. It expanded right into the valve exhaust port area. The red line shows how much of the now hardened up seal remained in the valve when the stem was forced away from the valve body. The seal material had to be dug out of the valve body.

This "trick" is certainly not new by any stretch of the imagination - it has been used for decades by less than scrupulous wheeler-dealers that injected guns with solvents of one sort or another in order to effect a quick sale. When the gun soon begins to leak again, then the cost of repairs falls upon the new owner. Problem is, the liquefied seals have usually created an often difficult to clean up mess inside the gun, thus the cost of now replacing the seals properly, becomes a more time consuming and costly job.

I guess it's time to stock up on lacquer thinner, wire brushes, and o-rings........

 

[Waterloomike]

A friend had 3 airguns from Poland. They were all pretty old. They had effectively used leather to replace the seals.

 

[leonardj]

A friend had 3 airguns from Poland. They were all pretty old. They had effectively used leather to replace the seals.

All the Polish made (spring) airguns that I have ever been into have all had leather seals right from the factory, so your friend did a proper job by replacing them with leather.
Can't recall offhand any CO2 guns that were manufactured in Poland.

 

[Waterloomike]

All the Polish made (spring) airguns that I have ever been into have all had leather seals right from the factory, so your friend did a proper job by replacing them with leather.
Can't recall offhand any CO2 guns that were manufactured in Poland.

I couldn't tell you much about it. I'm not up on airguns and he refused to get a license. He's dead now.

He was very handy and could fix anything that I ever saw handed to him, including old watches.