fwiw,
Buy a Wilton Machinist Vise, aka Bullet Vise, and fit a set of 3/4" baltic birch jaw to it. As a matter of fact fit SEVERAL sets of jaws. Take one set and epoxy/glue raw leather, available from Brownells, to each side to avoid scratching anything you clamp in them. I have Wilton Bullet Vises from 1946(the year the started making them) up until 10 years ago and I can tell zero difference in quality. My favorite size is the 3.5" in spades. I have them from 2"(comical) to a 6" that belonged to my father. The 3.5"s are still just about perfect...imho.
Regards, Matt.