With as much vehicle detailing work as you do and all the posts listing the Flex machines almost every time, if I were Chris and the Flex Company, I would GIVE you new polishers to replace what you have. It is just good advertising and Public Relations to do so. You are probably their best "spokesperson" whether Flex realizes this or not!!
The brass inserts might need to have some type of locking compound applied to them in production. Not sure how they are installed with a straight press fit or if are they knurled on the outside and pressed in. (Just my mechanical design background and familiarity with threaded inserts coming into play.) I think that needs to be addressed with Flex customer service and investigated by their manufacturing engineering staff. If you have this problem, I am sure others may as well.
Seems like bearing and backing plate grease for polishing machines and what type and manufacturer to use to replace the "factory grease" is a big issue in this forum.
Grease for polisher
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