Originally Posted by
JAJ0404
Al - Thanks for the info, I think I'm going to start by changing the inner 42 to a 39. It looks like a normal hex key on the front, but the back looks funny - - - Do you need a special tool to switch rings, or can I do that at home?
On the back it's usually just a slot. Anything reasonably stiff that can be fitted into that slot will do in a pinch. Although I will admit that the proper tool is easier to use.