Doug,
I used Astronomy-Shoppe.com knobs.
The springs used in the Guan Sheng 12" and Lightbridge 12" are the same.
Go to the above site and they have the complete "Rescue Kit" for your scope.
Delievery is fast, approx 7-10 days.
P.S. It will make a world of difference in collimating time!!!
With the stiffer springs you can also ditch the locking pins, as I have.
