Hobie Rudder Cam. Used in Hobie Cat 14, Hobie Cat 16, Hobie Cat 17, Hobie 18 after 1986, Early Waves, and Early Getaways. Fastened in the casting with a rolled pin that needs to be drilled out. Buy a cam kit with sister screws if they have never been replaced.
10480010 was 10480000
HERE is a page describing how the Hobie cam and adjustment system works.