Editing Step 4 —

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Find your controller box and locate its mounting holes on the back.

Place it on top of the 6x15 plate so it is square and the top hole is about ½” away from the top. Transfer punch the holes on the controller box to the plate.

Drill those 1/4" holes.

You can drill them a little bigger (up to 5/16") if you'd like, as it's difficult to get the holes perfectly aligned.

Punch the holes in the bottom piece.