Motor play?

[montyjcm]

Hey everybody,

So, I was replacing a spur gear today and noticed that the shaft on my motor (MMM 2200kv) had about 1mm of play (along the shaft length). I also noticed that there was a fine coating of red dust layered close the the pinion location, on the motor plate and motor. Is this normal wear and tear? Should I be concerned about the shaft play?

This is on a e-revo, btw. I had stripped my spur gear previously (too tight of a slipper I believe)

Thanks for the help!