Parts from Hennings arrived yesterday (already!)👍 😊
Along with the new wheels I ordered a set of brushes and springs; I had already replaced the brushes, but I wanted to see if new springs would help (I figured they couldn't hurt).
Turns out the "chattering" noise was due to (I think) uneven brush pressure: with the new springs this is running much smoother and quieter.
My neighbor (retired millwright) is returning home tomorrow; my plan is to ask him to press those new wheels for me. He has the tools and will do a good job...and I know he will be careful and precise. 🙂
Fun stuff...
Mark in Oregon