[White Rabbit]

Be very careful when you do this. I did it myself and introduced the most horrendous backlash into my system that took me forever to work it out.

If there is one peice of advice I'd give you it's that when you make the adjustment make sure you only turn the grub screws a quarter turn at most, and when you first try the new setting make sure that you only have your mount slewing at a slow speed. If you do it on 9 and you have the setting is wrong you could get slipage or binding and beleive me, there is nothing more terrifying than listening to your gears binding . The feeling is similar to being in a car when you notice you are about to go over a cliff.

If you do a full strip down as I did, make sure you have a full day to do it, you dont want to be out in the garden doing this when it gets dark. It takes a long long time to strip it down and put it back together. Actually that part is quite quick. Getting rid of any backlash you have introduced is what takes the time.

Good luke.