In another thread ( Buying replacement diffuser? - #3 by beams ), beams mentioned a source for original Panasonic jog balls, from which I immediately ordered a couple.
Today I’ve fitted them to both of my uConsoles. They do indeed operate more precisely than the ones supplied with the uConsoles. Although I was already satisfied with the supplied jog balls – in conjunction with the QMK firmware – I still notice an improvement. In my opinion, the movement of the ball is detected more accurately, which sometimes also results in a higher cursor speed. I have reduced the speed accordingly in the control centre.
The surface of the balls also appears to be more grippy and has a more pronounced matt finish than that of the balls on the supplied jog balls. I suspect that the magnetic axes are stronger and/or more precise, which, combined with the rougher surface, results in greater accuracy.
So if you’re looking for a new jog ball anyway, you might want to give Panasonic’s a go.