While there was some misalignment of holes that's now been rectified I was still getting some odd lateral movement in the driveshaft. It was hard to spot, except that the scraping noise of the blades was not constant and there was a periodic lifting of the perforated steel of the inner pot. I wound up taking everything apart to look at just the driveshaft - still wobbled. Looked at just the drive socket - still wobbled. The drive itself... hard to say, I'm really not sure. I'm a little stuck and have run out of time - hungry, tired grumpy boy needs attention as he has all weekend, so I'm not sure when I'll have a spare moment to try and sort this out, although I'm probably not mechanically minded enough to really do so.