Try as I might, I cannot get this cylinder to go back in. I just

>>1187159
rotate

>>1187160
I knew I forgot something

I would put a small chamfer in the inside end of the cylinder with a deburring tool or similar. The chamfer won't affect seal because it won't extend to the seal but it will "break" the sharp edge that's holding you back.

You can often use a worm drive hose clamp (sometimes with some shim stock to assist) to compress seals and piston rings.

If you do a lot of cylinders an automotive piston ring compressor is cheap and gets the job done.

I like this style

http://www.northerntool.com/images/product/2000x2000/205/205106_2000x2000.jpg

but these work too.

http://www.justoffbase.co.uk/VS155-V2_2.jpg

Hose clamp on small motorcycle piston:

http://i300.photobucket.com/albums/nn27/andr01dm/Big%20Bore/FATC_biggin_050.jpg

>>1187161
Was this the shocking conclusion?

>>1187159
spit on it, thats what i do when i try to put my cylinder in your girl and it wont fit in.

>>1187233
No, we just reused the old piston seals.
I think the ones we got were too big. It's an old cylinder. We replaced the gland seal, which was basically powder when we took it out, and I used >>1187165 this method with the hose clamps.
I look forward to working with you again /diy/

>>1187159
An idea is to warm the tube side (not too much regarding the rubber seals) maybe that helps

>>1187159
Cool it down with liquid co2