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Hello! I've been having trouble with an Elgin 554 movement but am eager to wear the watch so I attempted to swap the movement with another strong running 554. However the trouble 554 and the strong running 554 are for different dial types (trouble 554 is for a flat dial, running 554 is for a curved dial). I assumed that I would be able to just swap the cannon pinions and hour gears, however I found that the center wheel pivot was a slightly different diameter. The curved dial cannon pinion was much too lose on the other center wheel pivot and the flat dial cannon pinion was much too tight on the curved dial center wheel pivot. I was surprised that the pivots would be slightly different diameters for the same (554) movement, BUT I'm also very new to this and wanted to ask two questions: 1) will also swapping the center wheel between movements fix this problem? And 2) is this a common issue I'll find when trying to source parts from other movements of the same caliber? (Apologies if any of my terminology is wrong) Thank you for any help!