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I thought there was just a thread running about the 1/2" drive, but now I can't find it by searching the first 4 pages of threads. Anyway, here's a link to a past thread showing pictures of the Abell and "Service Drive" as well as both types of multiplate flywheels.
Notice how the bolt on the Service Drive is headless and the spring coil around it is cut back for clearance. Also notice the fine wire that fits through a hole in the headless bolt, to keep it from coming loose.
https://www.fordbarn.com/forum/showth...+drive+picture