DT750 motors, a shaft replacement

I have a couple of DT750 motors, well known from David Windestal’s first tricopter. These were my first order on hobbyking, so they’re old… really old. Shafts have been slightly bent from repeated crashes, but dt750s look good. I had the sudden urge to build another quadcopter the other day, and me, being cheap, I used what I had at

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