Not recommending (Don't think it is legal) but, a friend put the knob back on a Voodoo with JB Weld and taped over it and it has stayed on for over a year.
In regards to Hamate, son was having trouble with pain and bad bruising on palm. We added tap and a new grip to make his bats more like a no-knob and has not had any problems since (Knock on wood).