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You’re right it’s a problem with the mold design, not necessarily the process itself. Doing the molds over would be crazy expensive considering the parts work well enough. The bearings are too flimsy to change the shape but I found a bit driver that fits the hole as tightly as the bearing...

That’s the definition of a molding issue I think. The molds and process should be designed to account for shrinkage and other deformations to get a good end result. The B74.2 front arms had to be reamed to have the hinge pins not bind – the rear arms did not require this. So it can be done...

Here’s the minor diameter: And here’s the major diameter: What a lucky coincidence: the base nuts of a Schrader valve are knurled and out of the three, I found exactly the right size! I put the nut on the valve stem, pressed in, and rotated a few times. Lo and behold, the size is right...

Yes it’s the same part number for all three versions. The issue was not immediately obvious, it’s easy to miss. Next time when you rebuild the front, see if the inner race of the bearing spins smoothly even at a slow speed.

I was doing some bearing maintenance on my B74.2 and found the 5 x 10 x 4 mm bearings in the steering block (#92171, common for the B74 series) to feel gritty and indexed. I pulled the bearing and gave it a clean and lube, the spinning seemed fine so I pressed it back in. The gritty feel was...