I agree, but in my younger days, I spent alot of time changing tires in a shop, using the Coates 2020 and 4040 machines, and I remember having to remove those caps to place the rim on the machine. The shaft fit thru the rims center hole, and you spun a lock down to keep the rim tight. I cant help but thinking that the center hole on most of these Cragar 5 spoke rims seem to be the same diameter.
If the diameter was different, it had to be very slight and not easily noticable.
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