I have a clamp on vise work stop that will work well on materials down to about 1/4”. I need to clamp some 3/16” key stock and drill a hole in the center with a 1/8” drill. Using my DRO, I can pretty well find the center of the block. However, getting repeat pieces back in the exact same spot has proven difficult. I need to make a stop that will work with the 3/16 material. Thinking of just making a U shape clamp with the inside leg .030-.050 under 3/16”. Any thoughts on this? Needless to mention, I would drill and tap the outside leg for a set screw to hold it in place.