drilling a hole for the rudder.
this was the next step and I had already been thinking about how to do it. no drill that long in my toolbox to do the job.
time to create a special tool for it; found a piece of stainless steel pipe, 4mm in diameter, on which I filed a couple of teeth. then pressed the end slightly oval so the core that would be left when drilling wouldn't get stuck inside the pipe.
made a spare rudderpost, nailed it in position and clamped a piece of wood on each side of it.
put the drill between the wooden pieces and used another piece to press the it against the rudderpost.
first centimeter was done by hand and then continued with the electrical drill.
I must say that I'm quite pleased with the result as it came out almost perfect on the other side.