This is one of about ~16 #8 machine screws that go through the wooden top longerons to attach the metal that forms the top of the forward fuselage (in front of the cockpit). It was removed about ~30 years after the initial installation.

Due to the moisture content of wood, it is recommended that all bolt holes be coated with varnish to minimize corrosion. Like this.

Looks bad, but it wasn't much effort to remove, and I don't think the strength was greatly affected.



Ron "Rusty" Wanttaja