Originally Posted by
RCmayor
440 is a little smaller than 3mm, the little nubs that key to the brace might come off if you go that route. If the little nubs stay on it will give more support to any size screw you are putting on there plus it keys the brace to the bulk head. I want to try some 2.5mm screws which should be slightly bigger than the stock 2/56 screws.
I actually worked on this yesterday evening as I'm installing a +8 chassis on my ride... M3 is going to be a super super tight fit and hard to tap. The little nibs will shatter... 4-40 is pretty darn close. Neither screw heads fit in the recess in the alum brace though and I didn't feel like re-boring it so I used 2.5mm screws in a new bulkhead and the old-school carbon brace (which I was told provides more front bite... then again, like the hexes, I doubt am skilled enough to feel it)
Paul