G-Rand

Hi Folks: New to this forum. Recently picked up a 1983 Maxim 400 in great shape and low miles, mostly for my boys to learn on. It runs well, but as we're going through it I discovered the petcock was not preventing fuel from flowing when the bike was off. Opening the petcock revealed a failed attempt to use silicone to seal the diaphragms. I have a petcock rebuild kit, with two diaphragms on the plunger, but I can't make sense of putting it back together because: 1) both diaphragms are next to each other on the plunger and look like they were meant to stay that way, but when I pulled it apart there was a diaphragm on each side of a phenolic spacer. 2) the phenolic spacer has two "pins" on each side of it, but only one side seems to line up appropriately with the vacuum inlet part of the petcock. The other pins don't seem to align anywhere on the petcock side. Any ideas?? I downloaded the xs400 manual, but didn't see anything there. I can't find a diagram or description of the vacuum side of the petcock, only the fuel switch side. Maybe I missed it? Any help is appreciated! G-Rand