Bests & Worsts Reviews from Amazon

I have been using this router motor for years on my CNC machines. I have purchased around 36 of these motors for the past 12 years. Lately the new ones are failing within 50 hours of use in that the top bearing gets loose -- That is -- the bearing does not have a tight fitting either to the shaft or to the housing. That causes the bearing to move up and the shaft to wobble. In the past I would only need to maintain these motors every 200 hours for new brushes and about every 400 hours for new bearings. Only after many years of use would I have problems with the bearing getting lose in the housing and/or shaft. The problem I have now is that for some reason the housing for the top ball bearing is not available as a replacement part, making these motors unusable. Very disappointing.