I built the endcap tonight this one will accept single ball strings. I find David King inspiring so I think the bell shaping on the string retainer is fitting. I like the idea of it letting you know where the end of the neck is. The design is my own however, the way the strings are clamped is the difference from others. It's built from brass, I love working brass, being a metal worker for some time I've only lately got into working with brass. The funny thing about this metal is it cuts like butter, but if you try and rush a cut especially drilling, it can turn ugly very quickly. This thing should polish out very nice. Also now that it's built I can finish shaping the neck to meet the cap. I'll also point out that the string slots are not done yet so be nice!
Another view
Different angle