SIS2GO says the entire adjuster (353-5582) is $1191. For that money I can spend some time on it.
DIY replacement piston.
Sis2Go says the piston (353-5584) is $175. I had a local hydraulic shop cut a piece of 40mm chrome stock for me: $43.64 out the door. I guesstimated with a measuring tape that the piston was about 8.25" long (I had not yet disassembled the piston and cylinder). Came out pretty close:
The new rod is in the barber-stripe protective cardboard. The old rod aspires to be a mushroom.
Cleaning up the cylinder. The inside, past the O-ring looks beautiful:
I'll have to use some sealer on the outside edge of the outer seal to make up for that rough rust. I have a set of seals from CAT.
The grease valve seems to work, but
one set of the threads seem a bit bunged up:
And while the sealing cone seems to seat fine (the copper stripe?), there is some weird metal above it:
SIS2GO thinks that valve ( 154-2237 ) is $36 so it might be worth getting a new one. Maybe I could replace it later -- it looks like it can come out if I remove the keeper.