As per John Hamon - TraclksideRC
My original aluminium chassis plate on lemans was bent. Spoke to John Hamon about it and in his exp, only way is to put on a heavy anvil and thwap it straight. I also sandwiched the plate under my loaded trailer for a few weeks. no change. So likely to get a new plate on order or get lucky with a big hammer.
PS: That's T6 aluminium... it's going to be very hard