That's crazy Hoov. Looks like the mounting plate did it's job well, though. Great job on the construction and I may do the same thing.
I'm using one of these:

There are actually 2 screw holes in the chassis where the inside screw went for the EVX, so I have a button head on the outside edge and a flat topped screw on the inside of one of the adjustment slots. Stays put rather well with the MM and should handle the v2.2 once it's here.
Hope mine doesn't melt down. :(
That happen with 4 or 6S, Hoovartid?