On Jun 15, 11:36*am, Karl Townsend
wrote:

I fiddled with my Large Super Max till it was --O--O-- *(that's an
arrow through two balls, or "dead nuts", an official engineering term)
and then drilled and installed a taper pin to keep it there.

I like that idea. Is there any reason one could not install a big
taper pin, with a ring on the outer end so you could pull it if you
really needed to swivel the head? Then return it to tram by aligning
the pin and tapping it snug.