Hello Paul,
Unfortunately, the VFO wheels cannot be pulled off from above.
To dismantle the large wheels, you need to remove all screws from the back, then carefully separate the case halves from each other. Now you can see the back of the PCB.
There you will see a so-called C-clip. Remove this C-clip with a screwdriver, now the wheel can be pulled out upwards.
On this occasion, the shaft can be lubricated with graphite, for example.
It would also be possible to weigh down the inside of the housing with a small iron plate in order to give the deck more weight and thus increase the stability.
Incidentally, the C-clip can be easily reassembled with a pair of pliers.

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