OIC... I got it. Like I said, I have never used one.
I don't understand the purpose of bumping up tension for the last string. How critical is it to to one's game to rely on making winners while hitting the last string? Even then, the shot is so out of whack, 5 to 10lb of tension difference don't mean jack. You can argue that the loss of tension will carry through out the string bed. I'd challenge that too because the friction in the grommet won't allow that to release beyond the next string.
As for tightening the knob, since I use a crank, IMO 20 lbs tension on pliers = 20 lbs on crank. The difference is the risk of busted lip/chin.