The spindle taper is .602 t.p.f. (taper per foot) which is
the same t.p.f. as Morse Taper #3 but the diameter is
different. The diameter depends on which 14.5" model
If yours has the 2-1/4 x 6 tpi, threaded spindle, The major
inside diameter should be 1.325". If yours have 2-3/8 x 6 tpi,
then the major diameter should be 1.629"