I don't know if you feller's even thought of something like this. What I would do, (assuming it's set at a good tension at the factory) is immediately put some sort of mark with tape, north south east and west on all the knobs and corresponding marks on the body of the machine... color coded. Then measure the distance from the knob to the body of the machine and note that in the manual. so let's say N is red, W is green, S is brown, E is red. This way you can see at a glance if you've turned it a few degrees or 180*.