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@Nahguavkire
Don't get me started on AX. Shimano brought out Dyna-Drive in 1980 on DA 7300 AX and then 600 6300 AX the year after I think. The idea is that the bearings are in the axle which is screwed into the pedal which allows the foot to be lower than the pivot point of the pedal axle for better biomechanics. Also there was apparently a theory that the bigger axle and pedal shape was more aerodynamic...
All nice in theory but I've been waiting for a month for a set of adaptors from a Russian eBay seller to fit Speedplays on my 1983 Koga-Miyata Gents Racer with 600.