Hi Stu--
I cant tell you if the Bobs Knobs will fit your Sky Watcher Dob,but rest assured that by fitting Bobs Knobs to the secondary and primary will make your life alot easier--its money well spent!
I have just fitted a set to my Bintel(GSO)secondary and they are bloody fantastic.The primary has large knurled knobs as standard(abit like Bobs Knobs).
I also found that fitting heavy duty primary springs work well for me.
Im sure someone else will chime in with the right info.
Good luck!!
Cheers-Eric
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