Silly question: On the right side of the playfield there's a hex shaped threaded nut that screws into the top of the upper gate mount where the mist multiball ball comes from. It's also what the upper screw threads into which holds the plastic molded castle which covers the castle lock optos/end of wireframe. ( one of those long tubular hex shaped things that's threaded female on both sides, looks like a nut that's a few inches long)
Can anyone tell me what the proper length that part should be is? or have a part number?