Chinook Base 1-Bolt Tendon-EX pin

This design offers the superior convenience of the Europin system (also known as EX pin). To disconnect from the compatible extension, all it takes is pressing a stainless steel button.
While similar in design to the rubber joint, the tendon joint is stiffer, and it results in a more direct energy transfer from the rig to the board. It is preferred by advanced riders and professionals. The base can be loosened for quick mast track adjustments even in the water. 1-bolt design offers a little more fore/aft adjustment in the mast track than the 2-bolt design.