Okay, I finally got round to this. There's a vid for the overly curious. I used default settings and maps, and set for 4/8-way restrictor, for the testing. Essentially, two magents (the original for this stick, which is an older stick shaft model; and the other was from a newer stick shaft model) have a whole quarter turn of funky space that shows up in each direction you turn it to. My other two magents (one old model, one new model) have slight funky spaces that are very weird, but fixable via map configuration. This latter seems to me to suggest weirdness with the older model mechanical function, and that fits, in that there is greater wobble travel in that design.
Of course, if there was no shaft wobble, there would be no problems of this sort.
I played some DK and MsPac with the right candy magnet and the slightly altered map (the left column in the right box was set to center, otherwise it was the stock 4-way map), and especially MsPac was awesome. I was playing with my left hand even, and it rocked.
So I guess I needs ta ask Andy for two magnets.