Some might know already, but I reviewed the HN CRT RTR "UK Racer" for RACER magazine recently. one of the few flaws on a great car was the rear plastic brace. It connects from the rear gear box to the centre of the chassis- stopping any flex. The stock plastic one simply bends too easily, its long and too thin.
I couldn't find an official alloy brace anywhere, I saw some expensive and not so expensive 3rd party options but the part looked easy enough to replicate, even I could do a messy job of it.
But instead I gave my 6mm alloy plate to Roger Wood, who runs the bury metro buggy club, and rog did such a great job I thought it deserved a post in a new sub forum of its own

^ you can see the original in the background - the bend in the middle is of course from abuse. The one roger made is almost invisible, it's so shiney!

Rogers brace uses two screws at the front instead of the one on the original.

^ It makes everything else on the RTR look a bit dull and boring now. It would need to be run over by a REAL monster truck to break this, and even then...... Thanks Roger