i used a comercially available engine test mount bolted to a 12mm piece of plywood with a tank held up on a block of wood behind with a rubber band around it. so far ive tested a 52 Surpass, OS MAX .15, OS 46LA, OS 40LA and MDS .40 with no problems (apart from the MDS, but that engine never ran right to start with)

i may be able to get pics tomorrow