So I just received this plumb bob from Marco, as my White Water was missing one: https://www.marcospecialties.com/pinball-parts/20-6502-A
However, it doesn't fit on whatever rod is in the machine, it's too big and doesn't catch on the threads. Marco lists a few different rods and I can't seem to find a solid answer for which one is correct. Anyone know which rod goes with this plumb bob?