Can somebody tell me what this does?
 

The blue thing on top. A freind of mine gave me one. As far as I know its a Mirage part# MA-104, but don't know what it does. :confused:

Your help is greatly appreciated.
Thanks

That's for grinding down brushes. There should be different sized grinders that you can attach to the motor to serrade brushes, or make them fit a specific size comm.

Thanks!
 

Oh ok, I see now. Yeah it came with 2 different grinders. Thanks again for the help man!

No prob, good luck using it, just remember to make the brushes equal length when you grind them. Check them with calipers.

I hope you mean serrate :weird: . BTW, you should only serrate your brushes when you are trying to get top performance or when you are breaking in. Otherwise its just a waste of material.