have a listen

When I turn it to "the middle" where should/would the timing be on the tab? I haven't done this yet, but I may just to see if it'll run better.

dosn't matter... your just putting the adjusting slot you can see in the middle so you can adjust either way...

then adjust the one under neither for say 20 initial timing... then lock it down... now you can do back to using the normal means of adjustment...