I got it back together. Seems to be ok now. The problem (apparently) was the thing where you turn the 2 plastic parts at the bottom of the shaft so they put pressure on the snap ring. I now have spin and agitate.
I see that there is no info on the web about oil capacity. So I put in the same amount as I took out...measured againt the print on a couple of Parkay tubs. This brought the level to about 1/4 inch below the opened case edge. I then added a smidgen to account for what was left in the tub and what was soaked up in my rags. I then applied a bit of Form-a-gasket #1 around the top and bottom and sealed it shut.
While I'm here I want to state that at http://appliancejunk.com/forums/index.php?action=gallery;sa=view&id=723
the 2 plastic parts on the left side of the screen are in the wrong order for placement on the shaft. They should be switched around.
And finally, in the enclosed photo of my repair job, can you spot the mistake I just noticed?