Funnily enough i was just about to post about my addition of bobs knobs to my 12" Dob today... I also got the whole works; primary, secondary, springs, and telrad knobs...
I was surprised how flimsy the standard GSO springs are in comparison to Bob's...It always held its collimation pretty well before upgrading, but with these new springs, its not going to take one hell of a hit to bump it out of collimation again....
I also agree with Kev and Brendan, the thicker/stronger springs make the locking screws unnecessesary...
They definately make collimating sooo much quicker and easier...
Davin
