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Old Nov 11, 2012, 02:12 AM
granada don is offline
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life long racing nut & modeler
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Granada Hills Ca.
Joined Nov 2009
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Hi Stinker

If you can hold the back end of the motor where the shaft is sticking out and keep the shaft from moving, then lightly move your new adapter back and forth at the same time gently tighting the allen set screw you can feel it find the center of that flat in the shaft.

If the adapter is a tight fit then it is harder to know you have the flat lined up just right for the set screw, so screw it in then out and look to see if the set screw is leaving its mark on the egde or in the center.

After seeing the set screw mark off on the side of the flat that is why it got loose and rotated on you.

That set screw you have is a ' cup point ' and meant to dig into softer metals but not on the harder motor shaft.

I take those set screws on a allen wrench and sand the end smooth on a belt sander, then a scotch brite wheel to smooth out the sanding marks then it works good up against a hard shaft.

Hope this helps.

G Don
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