Originally Posted by paul4be
This is a reply to an old thread about this on a Mk1. Not had to do it, so can't confirm, but worth a go?
I remove the screw in the mag ring and slide it forward and onto the the tube under the ring is a boss which is held to the tube by three grub screws I tighten them the put mag ring back on and the problem was gone
Hi both I can confirm this is correct, I've got two mk1's and at one time or another they have both had this trouble, it's a quick easy fix and no need to send scope back.