The snap off quick release hub has a patented innovative design that is self-adjusting. As a result, there is no play in the mechanism over time, as is often th
Doug,
the pic you posted about the snap off looked strange to me - on my Superformance it is a slightly different design. Please find some pics.
The diameter on the steering wheel is approx. 78mm
But there is also a adapter plate between steering wheel and snap-off
When mirroring the 78mm diameter to the underside of the snap-off it seems too big
See also additional drill holes which seem to be drilled afterwards (seemingly to attach the adapter plate)
A 70mm diameter seems to be right
Verdict: the factory snap-off should be 70mm with an adapter plate to 78mm