833 OD sticking in 4th, chipped synchro

Thanks for replying. I would like to go through these one by one so I'm clear.

1) I read you said at least .050 clearance and there is at least that. The part of this that concerns me is that this brass ring has more space to move laterally than the others.
2) By feel, each key is supported by a spring as it springs back when depressed
3) I'm not sure how to confirm that. The bearing is flush with the case and the mainshaft gears align with the countershaft gears
4) Same as above, but at the rear
5) there is little wear on that 3/4 lever. In fact, in the 4th gear direction, it isn't even shiny. The scissor slots in the "comb" do not appear worn.
6) slider is original to the transmission, afaik
7) all brass rings were replaced when I rebuilt it. The rings were provided by Brewers. If one is incorrect, they all are. It's been a long while, but I doubt I would replace an item without confirming it was the same as the worn item.

I'm confused by what you said on the brass ring. Isn't the ring that's in there the later type? from Brewers site: '70-up stop ring syncro assembly