A pin in the hole in the top of the rudder will keep the tiller in place.
A 1x1 hardwood tiller is fine. The pin is attached to the tiller with a
bit of string. I can't remember if I've seen aluminum box tillers on
lasers, something with a black finish is popping into memory fom the
1980's. If you live near the water a walkabout at a sailing club on the
day of the week the lasers race should prove enlightening.

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