Scott,
Very glad to see the vise worked out well. That's quite a beast! I too have had little trouble with seasonal changes--I have to adjust the chain tension about one and a half turns of the stop nut every six months to keep it working butter smooth, but is remains perfectly functional if I do nothing. Hope you enjoy the next project! And this might be sacrilege, but one of my favorite applications of my chain drive vise is this
IMG_6561.jpg
Best,
Chris
"You can observe a lot just by watching."
--Yogi Berra