HOBIE - THUMB SCREW - RUDDER HOLD DOWN - ADVENTURE ISLAND
This is the small, plastic screw that was used to lock down the Twist-N-Stow rudder on early Adventure Island rudders. It was especially handy in higher winds. Hobie actually sent spare screws - check for them in the lid of the rear hatch.
This item should not be need on the 2008 Adventure Islands with the updated rudder up/down system.