Lol - it’s a silent ‘h’.....don’t know where it came fromSounds like you have loose nuts under ther tray ... or your chubby might be too fat and needs replacing with a Cubby Box.
W4elcome to the madhouse where any sane conversation can be taken literally and/or laterally in order to confuse the poster with either factual stuff or guesses, or even nonsense!
Enjoy your stay.
These "nuts" are Rivnuts and rely on a close fit with the the hole they're set into to grip. If they're turning, you need to either:
1. drill 'em out and replace or
2. do as I did and get a pin punch and whack the gripping edges until they bite on the metal of the support.
Option 2 is a temporary fix but might get you enough grip to fix your fatter-than-standard centre box.
It's possible to put some mini-mole grips on the underside that will hold them well enough to tighten a bolt into, but this is a real faff and may need a helper.
CheersRemove the driver seat and access panel and you should be able to reach the underside of the rivnuts and hold them with a pair of mole grips while you undo the bolts.