CCDave

Once I had cut out the second slot there was no balsa block above the top horn to glue the horn too, so I cut a piece of balsa the shape of a section through the rudder and inserted this into the rudder above the slot to support the horn, this was glued in with microballoons, I then turned the rudder upside down and glued the top horn to the inserted piece of balsa, this was easily accomplished by inserting the glue into the centre hole of the horn, leveling the glue to the horn, I then glued another piece of balsa the thickness of the gap between the two horns into the rudder, once this had all gone off I glued on the second horn onto the new piece of balsa and the original balsa block below that, it sounds more difficult than it is, its a bit messy so have some cotton buds and lighter fluid to clean up the mess with hanndy.

The templeate was easy to make as well, by putting three holes in it, one for the rudder hinge wire to go through and two others in line the horn width apart for the bolts to go into, this keeps it all in line whilst the glue sets, draw it out first and then cut slots in it to allow it to fit inside the rudder hinge point, I think the pic helps to see what I mean.

Hope that helps.
Mike

EDIT: to add drawing of template