Heres one I made from a piece of conduit...
it has a limit control that prevents hitting dolphin stricker and is offset on its pivit that makes it self extend as you put your weight on it.
Bungee cord retracts it after righting.
It stays permanetly installed.
To test tip your assembled boat over and put rolled up sail at top of mast... if you can lift that you should be able to right it on water.
I don't fear sailing single handed with this installed.
Much faster righting too.
A sailbaord mast would be ideal if you ever come accross one cheap.
photos.yahoo.com/klattu2
or
http://f2.pg.photos.yahoo.com/klattu2look in Sol Cat folder and hit the show all button.
