In the article Jim describes his modification as not attempting to machine the 5 degree taper used on the Dodge rim but instead to machine the new seating area parallel and about the same diameter as the mid point of the bead contact area of the Dodge rim. I would have thought that any lathe capable of this machining could have just as easily reproduced the 5 degree taper and exact start and outside diameters of the American standard. This would provide a better seat for the bead and make dismounting easier if needed. It really is not hard to change the angle of the compound slide and turn the handwheel manually on any lathe !
David
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