Mittleman Specs for vise:

Design and fabricate a vise with 3 contact points that can hold in
place an irregular object like a smoking pipe.
The vise itself can be clamped to a table.
A test object to be held will be no larger than 15 cm in any dimension
and no smaller than 1cm in it any dimension. The object will
be rigid, likely made of wood. Clamping the object will take no more
than one minute. Once clamped, the object will move no more than 5mm
when subjec to a force of 10 N. The test force can be applied in any direction.
Once clamped, the test object can be removed from the vise in less than one minute.

Vise