We have this old W.A.Whitney angle iron shear at work,good machine,old parts now obsolete.It consists of a frame that holds a set of blades and a cylinder that holds a knife.It works on the same principal as a quillotine.
It had sat in storage for years before we got it and the cylinder rod had developed some rust pits,but the rod side of the piston is low pressure since it only retracts the knife.We have used it for years,but the rod seals finally went out and it started puking oil.Quick call to the MFG found no parts,not even seals.
Normally I would simply order up a section of chrome rod and machine a new one.This one I couldn't,the end of the rod that holds the knife on is hardened and larger than the rod diameter.Grinding and re-chroming was out as well since I was quoted $550 and six weeks lead time.
My solution was to buy a section of chromed OD tubing and make a sleeve.Tube is 3.00" OD and 2.460 ID.Of course they didn't put a center in the end of the rod,so that was the first operation.
Centered up and the sleeve material-