I'm about to install my floor panels and heard about this happening. I ordered (and received quickly) 2 "step bushings" from TCW Technologies. A friend of mine installed them and says they're great. He also installed an access panel in the floor and a small hole under the fuselage, to access later if needed to tighten. I plan to do the same.
Working on section 33 - Baggage Area
Dues happily paid 2018