Hello "Alaska Jim",

I don't know anything about St. Paul hoists, but perhaps your cylinder does not use a seal at all. I resealed my 1941 vintage Hercules dump cylinder with Teflon packing. An example of what I am referring to: https://www.mcmaster.com/ptfe-packing/abrasion-and-chemical-resistant-packing-seals/. Using the packing is exactly like repairing and old style house faucet.


1941 Chevy 1 1/2-ton WW2 4x4 dump truck
In the Stovebolt Gallery
Lots more pictures