We had our club meeting last night and were talking about this issue. One method was to cut a piece of wood (1- 1 1/2 wide) exactly 11 3/4 inches long. Drill a hole in the center and mount to engine like a prop.Set in horizontal position, and for each 1/4 inch rearward movement of "tip" you have a 1 degree thrust change. This also works for up/down thrust, but of course you will need to turn wood stick to vertical position.