Dean wrote:

I've got a 1977 Clausing Colchester 21 x 80 lathe with a D1-11 spindle nose
and a 3-9/16 spindle thru hole. The lathe was missing the spindle Morse
taper adapter. Does anyone know where I could find one &/or does anyone know
what the spindle taper may be? It is bigger than a #7 Morse which I
understand to be the biggest "standard" Morse taper.

Some lathes use a jarno taper.

John