I’ve had a few Chipmasters and like them. Down to just one now that I doubt I’d ever sell. There was at least two different types of spindle bearings, the later type still being available according to a friend as late as 2022.
That front bearing is the same size as a 28985 made by a few vendors, wonder if any make it in a sufficient high enough tolerance for a spindle? You could also possibly use a 32013 and grind spacers, although the one for the OD would so thin it probably would have to be finished cemented into the bore. Maybe you had all that, was just curious so did some searching