ohw do you hold the armature in a Bosch Router Type b06601 615 734 15615EVSwhen removing the armature nut?, The nut holding the armature is recessed in and looks like the wrench to get at it is thin walled. Does it require a specialty tool. I'm trying to replace the two bearings. Once the nut is off do you tap the armature from the top to remove it. How much are the two bearings and what are their part numbers and where do I get them? kingharrye@hotmail.com