Geeetech

I was not sure if I should put this under stepper motor or extruder. I have a A20M. I am trying to install a WinSinn aluminum extruder. So far, everything has been going great. However, my extruder motor comes with a black gear attached to the base of the shaft. This doesn't allow the new mesher to sit low enough for the other mesher. I don't know how to remove it. Any ideas?

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