Just been sent this by Simmo;

http://www.opticstalk.com/forum_posts.asp?TID=5026&PN=1

Scroll down to the post from : July/12/2004 at 10:21

With front objective adjustments, you can turn them either way without worry... BUT with side adjustment scopes, like the MK4-M3, the M3-LR, or the other LR family of scopes, the adjustment must ALWAYS be made from the infinity end of the dial. Turn the adjustment all the way until it stops (past infinity), and then start turning it in a little at a time, until there is no parallax. If you "overshoot" the proper setting, you can't just turn back a little, you must go back to stop at the end of the dial, and start over again

Comments please !