Maybe a H26 rudder trick might work?
The rudder on our 95 H26 has a large wing nut for applying pressure on the side plates to help lock the rudder down. It also has a line cleat on the bottom of the tiller handle. This pairing up of locks also hinders the ability of the rudder popping up if struck underwater.We have found, after many, many sailing miles that simply tightening the wing nut as tight as possible, by hand, and then applying a bungee cord to the forward end of the line loop and attaching it to the tiller extension mounting post will keep the rudder in the full down position and also allow it to kick up when needed.I know it is too simple but try it. We used to cleat the line loop off but that prevents the kick up. A well tensioned bungee used without the cleat has worked 100% of the time without the rudder creaping up. That creeping can be what I consider one of the most dangerous conditions built into the H26.RayS/V Speedy