"Ned Simmons" wrote in message
...
On Sat, 21 Jan 2017 18:28:32 -0500, Ned Simmons
wrote:

Forgot to mention: You can generate a rack by rolling your gear thru
a
lump of clay. Measure the teeth of the clay rack.

--
Ned Simmons

Crafts stores sell polymer clay that hardens when heated to 130C in an
oven or with a hot air gun.
-jsw