Hi Mike

Last time I needed an adaptor for mine a local camera store (...been around a while...) was able to rumage through there stuff and came up with a coupe of them for me. If you can't find one easily, let me know and I'll see if I can find the spare one that I put away for "someday". I'm using my F3 more these days and it take just a regular old tapered release.

Cheers, Dave
(it's currently snowing in Vancouver BC, but it'll be rain tomorrow...)