Pipe Clamp Pincushion Cut two 12- by 16-in. pieces of 3/4-in. plywood and temporarily screw or nail them face to face. Drill 1-1/4-in. holes (if your pipes are 1-in. outside diameter), spaced ...

I like to 'align' my screw heads when I'm doing wall faceplates. (meaning, all the grooves on the faceplates face the same direction). It's an aesthetic consideration.