Williams, T. Walley, III2011-10-042011-10-041997From "MEC 97," Proceedings of the 1997 MyoElectric Controls/Powered Prosthetics Symposium Fredericton, New Brunswick, Canada: August, 1997. Copyright University of New Brunswick.https://hdl.handle.net/10161/4902Two single acting VAST push switches or the VASI operate a hand, elbow, or other device in dual-action push-a-little, push-a-lot switch will two directions. These switches are very reliable, but pose a number of problems that must be understood before one attempts to use them.