How to tighten tray side latches

No nuts on this one, it's a sealed unit.

aah- those
I know most older beatup hiluxes with them are really tight to move, but I have always put that down to them being bent out of shape. Maybe some delicate work with a decent hammer on the catch, not the handle could bend it enough to keep it all tight. The other thing is maybe something to widen the catch- I was thinking gaffa tape, but thats not quite a long term solution.
"If it cant be fixed with a hammer, its not worth fixing" and if that doesnt apply, get a bigger hammer.

Don't worry, that was my first thought!

Thanks, will give that a go.