Thanks for the link. I shouldn't have said "in the same way a tight motor belt does." What I meant was that high presser foot pressure also forces the motor to work harder. You could almost hear the sigh of relief the poor old 99 gave when I backed it off. You could actually hear a change in sound after the adjustment - the machine ran quieter. It seemed faster at full speed and there was less groaning when I moved at a crawl (my default speed).
ETA: I just read the thread on adjustment and I guess I already had the answer rattling around in my memory, because Miriam's directions (per an OSMG) were pretty much what I did. I confess that I rarely even consider presser foot pressure; I'll have to be more aware of its role in good results.
Last edited by Manalto; 11-22-2015 at 07:40 AM.