Hobie Mast Step Ball fits Hobie Wave and Hobie 17 kayak seat this is the factory stock

this is the factory stock set of 4 jib battens for a Hobie 16  with adjustable  leech  caps

and the system easily slides off of the track mount

YakAttack Lopro Wingknob

Foam supported Ripstop - nylon collar

I use 120 grit paper on a nice flat surface to take off a small amount of material

Hobie Mast Step Ball fits Hobie Wave and Hobie 17 kayak seat this is the factory stockHobie part # 50212301 This is the hard plastic ball that the mast sets on and rotates on . Fits Hobie Wave and Hobie 17 only. The stud that ball screws onto measures 9 16" diameter. There is a different ball for the Getaway, 20 and 21 that fits a larger stud. Sometimes called the dolphin striker ball