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You may already have this pdf file by Mark Headrick at Abbey Clock but if not then you should find it very helpful. He covers the Brocot which some of these clocks have between the plates (and outside the dial) and the solid steel recoil pallets ( I think that’s the one you’re asking about) that are common in the Japy Freres. This pdf is about the best I’ve seen out there for determining the dimensions.
Hope it’s what you’re looking for. Please let us know.