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One, get the ones for a C11. There are 3 screws on the secondary assembly and there might be one in the centre. Do not loosen the centre one.
To adjust collimation simply move the screws a little. You don't need to adjust it much. make sure you recentre the star image after each adjustment.
With Bobs knobs, you install them one at a time. Meaning, you unscrew the phillips head screw and then immediately replace it with a bobs knob. Then do the next. It is really easy to do, all you need to do is follow the instructions. Once they are installed collimation can be adjusted really quickly.
Best of luck.
If you need more help let me know via PM. I have owned quite a few SCT's now and each has had bobs knobs installed.
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