On the oilite questions, I have had several embarassing failures with
oilite bushings, particularly in smaller sizes. Some of the bushings
have to be machined after pressing (and not spin in the bores) , so I
give a good strong fit with a vise or hydraulic press. And the inner
bores look like washboards! I typically have to drill and ream the
bushings, which are intended to be a finished size.