Interesting, thanks for that. I will have to check mine and the wife’s, I had to send mine in because the the nut on the screw that’s at the back of the top strap was missing.
^^^^^
with an allen wrench from the bottom. Mine backed out at one time. There was a video on youtube that pointed out this tendency and I checked mine and sure enough it was backed out. Used some locktite and it's been fine since.