Theres a grub screw down in the bowels of the box(well a couple actually, but only one of them has a habit of falling out....) If you've taken the top casing off the box then you might have done it but if you havent, then you havent (if you see what I mean) Its difficult to describe where it is, but basically you need to take off the entire top of the box and fiddle around to get it tight - best way is to take the reverse switch out and then you can tighten it up whilst the box is in neutral.
If you do it, take the screw out and clean everything really well, then use the highest strength Loctite you can get your hands on (but obviously, NOT super glue..
Bri
