you need to change the pinion gear for a new one. Most likely reason for teeth worn is the motor height not adjusted to the correct height. To change the gear you will need a special tool made for that operation. You might could do it withut the special jig but life is easy with it.
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I must not fear. Fear is the mind-killer. Fear is the little-death that brings total obliteration. I will face my fear. I will permit it to pass over me and through me.
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