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Hello, As a beginner in the field of watch service/repair I have stumbled through a few movements and picked up so much value and guidance through Mark's videos. Lately I have taken a fancy to a couple of old Revue Sport watches with Revue 56 movements. These are supposedly late 30's or early 40's and the ones I have are fitted with Incabloc protection even though I have understood and seen examples on the web that the non-inca may be more common. In one of my movements I have a broken balance pivot and would prefer to swap out the complete balance (# 721) for a new one as I don't have the tools/skills yet to swap out the staff only. I find that there are different versions for the staff (inca/non-inca) available and the dimensions are close to identical, there's only a diameter that differs very slightly in the numbers. I have found suppliers for the 721 non-inca balance complete part and my question is if that part will run in my inca version of the movement? With the overall staff length identical between the staff versions, there should be a decent chance or...? Grateful for any advice out there... /B