Those hex plates have a special kind of turnbolt in them - yeah, either true 1/4-20 or 3/8-16 thread, but also with an unthreaded capture neck portion. The local camera store sells them. But I can't find the replacement screw model no. on the B&H site - just the complete hex plate plus screw in both 1/4 and 3/8 versions. In the past, I've used ordinary flat head 1/4 or 3/8 screws when I wanted a flush countersunk version rather than the turn knob projecting below the plate. But these are so cheap - plate and screw combined, that you might as well just order it from B&H or another analogous source. Make sure you get the right sized hex plate - there is more than one.
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