In article ,
"Wild_Bill" wrote:

Maybe.. can't tell much from the sketchy drawing.
The pins look like stops for the spacer tubes, to me (assuming no shoulder
on arbor shaft for the spacer tube to fit up to).. whereas Joe stated his
grinder arbor shaft does incorporate a shoulder.

I got a clean pdf from Vintage Machines, and it's clear.

http://vintagemachinery.org/pubs/detail.aspx?id=2319

Joe Gwinn