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Having made the steering bench for the tug 'IJssel' and screwed it together I took it to the wheelhouse to check its fit.
I should have known not to make it at a right angle to the back panel of the house; this is a boat after all.
A little adjustment with a couple of wedges and I could measure the angle that looked right.
3 degrees - now I'm stuck with a song in my head for the rest of the day.