I have recently rebuilt a Prindle 16 and used the rudder rebuild kit to snug up the rudder system. The main problem I have been having is in locking the rudders down when we are getting going. The rudders just don't want to catch and stay down and we end up tying the rudder lines around the tiller bar. Any tips on how to cure this or is it simply old parts on an old boat that need to be replaced? Thanks in advance for any help.