How to Make Sanding Easier When Building Cabinet Doors with a Bench Vise

When I’m building cabinet doors and need to sand the edges of the rails and stiles before assembly, I don’t want to accidently round over the corners with my sander. To prevent this from happening, I clamp them all together in my bench vise. But since the frame parts are narrower than my vise jaws, I place a thick shim underneath and on top of the vise screw. It keeps the edges of all the workpieces flush, creating a broad surface for more controlled sanding.