The dials are held in place by a grub screw, you need a small allen key to remove it. Some grub screws are held in place with loctite so you my need to heat the dial up with a heat gun to melt the loctite before it will budge. Once you have removed the grub screw the dial will come off and you just need to knock the pin out/halfway, then just put it back on.
I think it was like a few quid extra for the dials, not much, and worth every penny anyways but you dont have to get them replaced.
Whats the damage? - Do you mean why did I get them serviced ? Basically because the handling was a bit 'off'. There is a massive thread on it somewhere called 'unstable at speed'.
Good question, beat me to it. Been busy since yesterday and was gonna ask the same thing. I think mine just have never been touched by the comments from former owner and what's said above