You might try the new site http://groups.google.com/group/kayak-newfoundland-and-labrador
For my part, If it is aluminium, I would just take it off , cover the
shorter part of the rudder with cloth, put the shorter part in a vice
and carefully straighten it with your hands.
If you have to heat it be vary carefull and keep the flame well back.
Aluminium melts and any coating on it will be ruined by heat.
Oh... I have done this a couple of times.