This video demonstrates how to float an assembly part in SolidWorks, so that it is no longer in a fixed position. Then two more parts are added and the coincident mate is used to mate the the components.
0:00 Introduction
0:15 Float
0:24 Insert Left and Right Vise Jaws
0:55 Fixing Solid Jaw using Coincident Mates
1:25 Mating Moveable Jaws to the Solid Jaw