I picked up the Tamiya height/droop gauge, and love it for that exact purpose. It's wide enough to sit the chassis end on the desired height, and you can change the screws accordingly. Plus, it's BLUE!
Originally Posted by Rick Worth
Easiest & most consistent way I've found is to have several shims with you. If you want the droop at 2mm above ride height & are running 4mm of ride height, simply put a 6mm shim under the chassis & lower the arm down with the droop screw until the tire just touches the ground. That way, all the tires are set seperately especially if running foam & one has wore a little more than another. It's also very fast way to do it. R.W.