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I supose it depends on how fussy you are about keeping it original, as you well know with a lot of older watches now you can’t just phone a supplier and expect them to have the parts on the shelf. So if it were me I would first have a scout about to see if I could locate the correct part at a reasonable price. If I found that was going to be a problem I think I would be inclined to reduce the pivot size as if things went wrong it would be possible to re-pivot the pallet arbor. With bigger pivots and larger jewels I wonder if the increase in friction would cause any problems in getting the watch to run as it should?