Maybe there could be a lever/lock type assembly where the jaws are placed in
a channel and then the channel is levered shut with the jaws being drawn
down into the channel and secured in a single motion. I am sure that a
mechanism could be devised that would be strong enough to perform the task
of holding the jaws in place and also allow for the sliding action. I can
see it on the back of my eye lids, but I can not eplain it too well.

Ray