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Threaded M4 holes in thick panel method
Holes are drilled into the back of the panel, stopping short of the panel front to preserve
invisibility. The holes should be tapped for M4 screws. Customer-provided M4 screws of the
proper length go through the through-holes in the bracket, then screw into the threaded holes
in the panel. The spacing is the same as for pressed-in studs.