Thanks guys for all the advice.
Matt,when I put the one peice gudgeon in, I tried to get the gudgeon parrallel to the outside edge. What i'm thinking of doing is either to rotate the gudgeon anti-clockwise to bring the lower tip in, or to epoxy the lower hole of the rudder again and drill at a slight angle, and use spaces to set the rudder in the housings. Does this sound like a possible solution to the problem?
Thanks
Clint