For those of you unlucky enough to have a Poly-800 that is missing its joystick knob, I have 200 custom manufactured knobs available at
http://patrioticduo.tripod.com/hawk800/buythekit.htmlThese knobs are manufactured from similar high quality ABS plastic.
But I had them manufactured with slightly larger diameter so that they're easier to operate than the Korg original.
You can see a close up picture of the knob here
http://patrioticduo.tripod.com/hawk800/The knobs are $15 dollars each plus $1 package and shipping.
I only have 200 knobs so don't delay!
Enjoy!
Mike