Thanks, I'm not sure why I didn't think to go look there. It's like the board was already designed for the smaller potentiometer - the holes already existed.
So I finished my rebuild last night, and finally put power to the board. Before the rebuild, it would instantly blow the transformer fuse (which now has the extra fuses for further protection). Now, the fuses don't blow, and all of my voltages are good other than the 4 and 5 volts. The 5 volts is 2.3 volts, and 4 volts is ~1 volt. I can clearly see that they are related on the schematic. Turning the 5V potentiometer has no effect on the voltage output. Grrrr.... Mind you I replaced all of the electrolytic caps, every zerer / diode, all transistors, SCRs, voltage regulators and potentiometers (via the kit from Big Daddy). It's been a labor of love, but something still isn't right. If someone has insight on the 5V part, I'd love some pointers. I'm guessing it's related to the LM732, which probably is doing its job, but there's something wrong somewhere. Seems like the potentiometer for the 5V isn't doing its job, possibly there is a solder bridge that I missed on the back of the board. Will check tonight. But again, if anyone is a system 1 PS guru and has advice, I'd love to hear it.
Another fun problem. The ground plane on the game has 10VAC on it. So if I lay my arm on rails, coin door, etc., I get a nice little tickle. One problem after another....