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Several designs ranging
from simple to fancier are pictured below:

This
is a very slick example using an air grinder and QCTP adapter...



Router-based
TP Grinder: A Bit Heavier Duty!

Router-based
TP Grinder Again...

Sewing
Machine Motor TP Grinder...


Dead
Simple Fabricated TP Grinder from a Right Angle Grinder...

TP Grinder
from a Makita Trim Router...


A
TPG with a slightly larger die grinder. Note the cam action atop
for turning on the grinder...

Yet
another die grinder TPG...

DeWalt
Zip Tool is a Heavy Duty Dremel-Compatible Machine...
Nice
one from RCPlanebuilder
on HMEM


Spindle parts. Note the knurling on the shaft--original
cut too small. Knurling raised it to fit the bearing better!

Drive components.

Electric motor is an RC Plane starter. It proved
marginal according to the builder...



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