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Hey Chris, I would say on a average American movement the most common size pivots are between 1.20mm to 1.50mm. As far as running across movements with bearings it is few and far between, the Int. time recording regulator already had the installed. it appears the bearings are in places where there is alot of force, On the Herachede there was a bushed pivot area that had a steel housing around it giving it a way for adjusting the end-shake as that particular gear meshed with a beveled gear for the chime mechanism, could it have helped with wear? I dont think so as I had to put a new bushing into it. here is a picture of that.
I love to experiment with new and exciting ideas, but also remember that a 100 year old clock like this only needed 2 bushings and it keeps perfect time. stay warm, and if you already are the please send me a jar of warm air. William