OK, so here's what I did (right or wrong, I don't know, because I wasn't able to find an exploded diagram, or even a photograph of any sort) and why.
The order that the photo shows is the order that the pieces came out.
It's fairly logical, but the marks didn't make sense.
[ATTACH=CONFIG]463713[/ATTACH]
When I reassembled, I reversed 3 and 4, as indicated by the numbers because of the marks on part #5.
The marks you can see at the 9, 5 and 2 o'clock positions directly correspond to the "feet" on #4. My thinking had been that marks like that were likely created from the years of use where it had been working right rather than the months where it had been working poorly. Additionally, the marks on the washer (#2) corresponded with the top of the beehive spring, and there wasn't a mark of any kind on the other washer (#4) that corresponded.
Range of tension adjustment feels good, and as long as no one tweaks til the knob falls off, it should be good.
This machine also didn't seem to go all the way to 4, but I didn't worry too much about it as the range of stitch length seemed reasonable.