I'm currently in the process of rebuilding one of my "A" series presses, the early "A" models have cast steel (softer) links which tend to wear (after a couple of million cycles) because of the hardend steel link pins used in the 1/2"upper and 5/8" lower toggle castings.
To solve this (loose link) issue I reversed the links and rebored the bottom to accept a new pressed in 1/2"ID X 3/4"OD bronze bushing (which is now the top) and rebored the worn 1/2" end to a machined finished 5/8"hole. Its amaizing that the main operating ram still remains very close to its original tolerance, most likely because of the vertical travel having little bearing surface wear (unlike the link arms).
The next step is to bead blast the frame and powder coat with a nice industrial quality finish and polished the other parts as needed.
She'll be good for another couple of million cycles, and/or another 50 some odd years.