I set up two of these replacing the stock hardware with the copper. You must open up the inside as the resulting hole is too small for the commutator.
I used a koford splined brush radius tool to carve the hole bigger it measures .210 dia. After removing the hoods for deburring, I was quite pleased with the precision and the fact that the brushes are supported all the way to within .005 of the comutator.
one of the motors with a smaller com works really well, the other seems to eat brushes and has not been as fast. the com is still at 199. I'm using the PS X12 arms in them.
Question: motor experts: what is a good way to open up the hole to clear the commutator? And might these brush holders be too close at 5 thou?
They don't seem to be getting burned by the arc blast but I've never seen any motor with them this close.
All opinions welcome.