A couple of motor reassemble questions

[Tj4orange]

I got my new/rebuilt motor back and am concerned about reassembly. The motor guy said it was wise to replace this deformed lock nut. They weren't meant to be reused.



I went to Fastenal and the closest thing they had was the thicker one in the pick. I'm concerned if this might be a problem!?




...

Also another question is. When I took the motor to the motor guy, I didn't realize this nut and other threaded piece that goes on the shaft weren't part of the motor, so the motor guy took them off with a impact wrench.

I just got a impact wrench but haven't used it. How do you tighten the nut when the whole shaft spins?


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