I don't have one, but I can fix him for you. Send me your broken figure and 2 others that you don't care about, and I'll pull out the Rubber connector from one of the 2 donor figures and fix your Fisto. (The reason I want 2 extra figures, is in-case the rubber leg attachment part breaks during the removal process.)
Just pay shipping both ways. And when I'm done I'll send all 3 of your figures back to you.
- - - Updated - - -
... Or I can do the O-Ring fix as show here if you don't have any donor figures:
(Scroll down to the bottom of the webpage, the updated fix with the smaller parts is the one I would do for you.)