3M 20922, PSA Cloth Disc 348D, 60 X-weight, 1-1/2 in x NH, Die 150S, 7010326528. 
Air Turbine Tools 201SV - 1/8" Straight Hand Tool Series with Brake, 65,000 RPM, 32164 
Insize 3594-3, DIGITAL NON-ROTATING SPINDLE DISK MICROMETER, 2-3″/50-75mm, 6928640375224
$587.47
Resolution .00005″/0.001mm
Measure root tangent length of gear.
Non-rotating spindle
Button function: on/off, set, inch/mm, ABS/INC.
Data output. LR44 battery, automatic power off
Ratchet stop.
Supplied with setting standards.
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