Originally Posted by MikeS
I recently bought one which had been messed about, as you say the small screw is just a stop what you have to do is as you say move the actual lens in/out so this what I did on a known 55 yard target it's trial and error you will of course need to make up a tool to fit the slots in the lens/lock ring and down to 10 yards does seem to be about the norm.
Cheers...Thats what I thought. Tried making a tool from some steel plate I have but it just bent when I tried to turn the lens locking ring. Will try to get hold of some thicker plate.