Neu 1527 Shaft to Coupler

Recommendations on best way to keep motor shaft from slipping inside the coupler? I have the neu 1527 8mm shaft and the big coupler with the 2 grub screws loctited down but after I hit a rough spot it slips now. Grub screws are black and worn down now. Shaft is scratched up.Why doesn't the motor shaft have a flat spot like the smaller motors..?

You have to file or grind flat spots on the shaft for the grub screws

Larry

Dang I figured that but I also figured it would come RTR....I appreciate it man.

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Originally Posted by HYDRO333

Dang I figured that but I also figured it would come RTR....I appreciate it man.

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Doesn't hurt to tape up the front of the motor before you grind it to keep any metal filings out of the motor.