My Neu 1527 (1250KV +or -) has about 3MM end play in the shaft. I am the third owner of this motor and I think it was misused in the past but it is still running fast and winning
in our club races. Question would be - is this something to worry about and if so is it repairable? Perhaps bushings on the shaft end or a spring in the same place are shot? The
bearings seem to be in good shape. What end of the motor would have to be opened or would it be both if there is a chance of repair?

I have never tried to repair a motor before but would like to save this one from an ugly death.