The pots have been sticking on one side for a while now, with one pot almost failing to move. Unfortunately I've got the dreaded low speed grabbing. Visually there appears to be no run-out on the discs, so I'm going to explore everything else. The Powerhouse stuff looks good, I think give the pots a good clean and fit new seals to see if it makes a difference. Funny thing, the wheel was reasonably free to rotate when off the ground, but was binding and hard to turn when I tried to rotate backwards.
It took me a good bit of pumping to get all the pots out into the middle position as in the pic.