Home made degree meters and how to line out to get the engine thrust. I lined out a two degree thrust with a ruler and protractor. To find out how far to the left you will need to move over the engine for off set you just measure from the back of the engine mount {when the engine is mounted} to just behind the thrust washer on the crank. Then on the lined out paper if your thrust washer is say four inches from the back of the mount just measure across the lines at four inches, that's how far you have to off set the engine on the fire wall to have the carnk centered in the cowl.
I make up the meters with scrap ply and give them out to friends at the field. You can buy much better meters from Central Hobbies but I don't want to part with my money any more then I want to burn out my brain cells with all that thinking stuff!!