Originally Posted by gantongunner
on a big nikko you remove/unscrew the front locking ring it might be quite tight
then on the exposed threaded bit you will see 2 indentations they are for turning it
I don't have the proper tool but found the back of a knife fit inside and spanned both grooves
screwing it in reduces the min range and vice versa HTH
if need anything clarifying I will take pics if needed or give better advice lol
Great, thanks for the advice, much apreciated sir!