New Thumbstud for Chaves 228

[mastersword]

Looking for a new thumbstud for my Chaves 228. Either larger than the current ones or the same size (1 sided is fine). Preferably a darker stone wash to match the rest of the handle but polished works fine. Just looking for something a little more rounded and without the openings at the top of the thumbstud. Currently getting some skin caught in the opening of mine.

Thanks!