I just built a square frame out of 4X4's that i had laying around. the weight helps hold it still when the engine is running rough at first. I used a piece of aluminum .080 sheetmetal from work (I fix full size planes in the USAF for a living) and another couple smaller plates that bolt to the large plate so i can adjust for different engines. broke in my .55AX and a Saito 100 just fine so far on it.