I'll refrain from trying to mash the shaft then.

Either the unit has become so hot (about 2 hours solid operation, on my desk) or I've sufficiently shredded the fins inside the knob, but there's barely enough friction to hold it on.

If there is an interim fix that seems/works the best, could people submit them and have it be a FAQ until a new knob is shipped?

I guess the problem is compounded when the user is forced to twist the shaft with their fingers, getting oils and sweat on it, further reducing any friction.

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MK2 #141, green, 12GB