Most of the newer S22s seem to have them (#801 and above). I'm not sure if its standard now or an option. Schock would be your best source, they are very helpful and if not in stock they will tell you who they get them from.

:: Does anyone use a hinge on the butt end of their mast to
:: make raising and lowering easier? I am thinking it would
:: be similar what I have typically seen on a Moore 24 or
:: Express 27. Does anyone know where to buys a hinged mast
:: base? Ballenger? Any advice would be appreciated.