Recommendation? Sketetool thumb stud/bar mods?

[Steve Dubya]

I got myself a Skeletool and associated bits as a Christmas present for my kids to give to me this past year (to replace the Cyber Tool SAK I've carried for years), and having gotten a Stammer mod for it I go to wondering if anyone had success with any sort of reasonably easy-to-come-by thumb stud or bar mod for the blade.