In article t, EdFielder
says...

Cadillac version bored the USA sleeve and turned the nut down and pressed
in and drilled for a set screw

The original SB part used a pin installed cross-wised to the
bronze nut to retain it. A setscrew would probaby strip out
or come loose in short order. A simple press-up fit would
also fail in short order.

I think the original design has some merits.

Jim


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