Ski-Doc Fin RecorderThe Ski Doc fin recorder helps you to preserve the perfect fin setting once you have found it Ski Doc Fin Recorder The Ski Doc fin recorder helps you to preserve the perfect fin setting once you have found it. Simply place the fin recorder onto the fin with the setting you want to keep and tighten the wing nuts and your settings have been recorded. Then, if your fin has been moved simply loosen the screws so it can move freely then attach the fin