I have an FD adapter which has been permanently attached to a 50mm f/1.8 FD lens since I first bought a GH2. It was easy to put on and, I seem to remember, easy to remove, but a year or so later and I can't for the life of me remember how to remove the accursed thing (to use the same adapter on a different lens). Google searches reveal countless videos showing how to put the adapter on, but the absence of any instruction regarding its removal suggests its something very simple that I have overlooked.

Any suggestions?

Well, what do you know.... Having spent an hour or so wrestling with it, I returned after lunch and off it came with a simple twist. I guess either it was a little stiff, or I'd lost the knack of twisting the silver breech ring without turning any of the other rings...