all had splined hubs and knock-offs.
There are no splines for the wheel or the hub except the
course ones used between the rear axle and the hub. The
twin cam hub has a threaded spindle to accept the wing nut,
but no external splines. The hub has a flat face just like
the wire wheel version but has four evenly spaced holes
about 5/8" drilled in it. On the back of the twin cam wheel
are four cone shaped lugs which go through into the holes in
the hub. The central cone for the wing nut to bear against
is attached to the wheel using the same cone shaped lugs.
MGA twin cam
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