And here is the latest Mk3 vertical key, this is about as best as it gets for this design, I can see why vertical keys died out they are over complex really, there are nearly 50 parts in this key, unless I can think of a better vertical design I probably won't make any more, it is a lovely key though, lightweight yet crisp action and quite small , I suppose to be honest I have over extended the handle, it would work quite well shortened but there it is time to move on to some different designs :)