Artic weather had me inside watching too many Woodwright videos and saw how handy a Moxon vise and hold downs would be. Have a habit of using whatever is laying around and it worked out this time. Didn't have strap iron thick enough for the hold downs so doubled it like a leaf spring for half the length. Seems to work.
Liked the idea of acme threads but once again had some 3/4" all thread. With the knockoff style wingnuts I can back off an inch of slack with one spin so acme thread wouldn't be an improvement. In fact with the finer thread I can easily twist
the knockoff just a hair more to rotate it out of the way.