You are killing me with this post! I have two Contax to Leica M adapters that required quite a bit of adjustment to make them work. They were both from johnluk. In hindsight I should have bought the ones from Amadeo, but at the time there was absolutely nothing on the internet about the different adapters. I kind of want a LTM adapter now so I can use the lenses with my Canon 7 as well.
You can read about the adjustment process here-