Drilling a new five hole pattern in a pair of axles and brake drums. I use my Model K index head on the K&T mill and jig bore the drums with them toe clamped to the Bridgeport table. Five hole locating can be done several ways and I give a demo on a few in this video!
https://www.HotDrillScrews.com/bonded_neoprene_washers.htm have a very large inventory of bonded neoprene sealing washers and epdm washers.