Is there a knack to fitting?
I've been trying to fit my Radio Racers undertray and it's proving to be approx 1mm too narrow and short...
Depending what end I start fitting from, when I get to the opposite end the the tray edge is short of the chassis edge, ie. countersinks don't align to holes (obviously haven't drilled these last unaligning holes yet).
More of a problem is the width: it doesn't quite squeeze over the widest points of the chassis, such that it doesn't sit flush to the underside and the sides are flared outward because of this.
Am I missing a trick/technique, such as warming the tray in hot water to let it stretch??