I just returned home from trailering both of my RT Limited bikes to Florida and back. Upon unloading, I discovered a metallic, threaded fastener laying on the trailer floor. I determined it to be stainless steel because it won't hold a magnet, and it does not scratch easily with a blade. Also, the threaded portion accepts a M5 screw.
Any help is appreciated! I'm not even convinced it's from either of my bikes? Maybe a previously undiscovered fastener from the past bounced from the corners?
Don't ya just love a good mystery? In as many times as I've broken my 21 RTL down, I don't recall ever seeing a fastener like that. Great pics to help us solve it. Looks like it threads onto some kind of rod.
The way it's shaped it goes into a hole and is held in place by its own bracket so it don't spin, I think the guy's above are on to something with an aftermarket holder of some kind. Good luck!!