I am looking for a short slow motion knob for older Celestron/Vixen Super Polaris mount. The type I am looking for is 1.5 inches wide with a 1/2 inch metal shaft and held in place with a setscrew. (See Photo) If you have one of these laying around let me know. Please advise of condition and asking price. If you have any questions feel free to contact me. I prefer to pay with Paypal but that is not a requirement.