Just a few pictures of a St Andrews Cross leg vise I am working on. The St Andrews Cross (SAC) hardware is very simple to make, and much nicer to use than a pin and guide in the bottom of the chop.
People often refer to this type of hardware as a St Peters Cross, but that is a misnomer.
I will have drawings and more detailed specs of the hardware up on the site in the coming months.
Benchcrafted makes some very nice hardware for a very reasonable price if making your own hardware is out of the question.