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How strongly are the brush springs attached to the carbon brushes? My brushes do not look very worn, they measure .2445" (carbon block only). However, one side the spring and the brush make contact but are not held together by anything other than the spring tension. Is this a problem?
This 'Triac' chip, is that the tiny glass 'diode' looking item by the on/off switch inside the housing?
The article does not mention why an armature needs to be replaced. So why is it necessary to replace an armature? If there is no obviously visible problem, what could be wrong with it?