This runs on 4 AA batteries and is two speed.
5000 RPM and 10,000 RPM. 3 volts gives 5000 RPM
with this low voltage DC motor and 6 volts 10,000 RPM.
The disk diameter is 2.5 inches.

The trigger holes are actually too large at 1/8th of an
inch. Too much light is getting through. On the next one
and for the V8 distributer version of the ignition
I will go down to .1 inchhole diameter.

Paul Lamar

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