Here is a picture of a lot of different prototypes in the development of the variable resistor contactor board.

I say board, because it ended up being a circuit board.  But initially I was experimenting with a mechanical assembly.  Different materials, one piece, two piece, five piece, molded, machined, 3D printed.  Eventually milling a circuit board was the most elegant and reliable solution, and the only tradeoff was a small risk in contactor tracking repeatability.  That in itself is of no concern - the tolerances on the current parts are wide enough to allow for a little misalignment without any issue or loss of function.