On Sunday, July 21, 2019 at 5:42:28 AM UTC-7, Jim Wilkins wrote:
http://en.sanouchuck.com/english/pro...p?id=45&type=5

Looks intriguing; the presumption, then, is that somewhere in the world
is a rolling mill turning out pentagonal bars? And mill vise jaws with
108 degree and 36 degree vees?

The pentagonal spud on a fire hydrant cap/valve is the only item I can easily
imagine this chuck holding.