Ben, that would make sense that the marked are for keeping
the line-boring correct, as the piece looks totally symmetrical
180 degrees apart, in size, holes, etc.
Ed, I thought about the slide hammer for the
thrust bearing, but it doesn’t appear the center
hole is threaded. Not sure if a screw tip on the
slide hammer would booger anything up or not.
If the compressed air doesn’t work, then I’ll try
the coat hanger approach.
Thanks!