I use a tray about all the time. He might just have the beginner shakes which will pass with stick time, but the tray will help with the tenseness. I can hold the trans. either way, but I am much more relaxed with the tray. I can't grip comfortably grip the trans., but the tray lets me concentrate on flying the planes. Especially the quick movements of a snap roll, etc. Trays are a little pricey but will last a longtime. A handy person could build their own.