I made a hold down using PVC pipe and a large (pole barn) nail. I can't take a picture of it (camera not working) but will try to draw it up. It is just pused into the ground and holds the plane by the horizontal stab, when all is adjusted set the engine to idle, pull the plane back and the holder drops out of the way. I'm not sure how large a plane it might hold back but have used it with a .91 four stroke and a Moki 1.8 two stroke. I'll get back.