The Tension Knob is the vital part that holds the rudder blade in the blade housing (using the Hitch Pin / cotter pin) and connects with the Tension Spring.

Price is for one Tension Knob.

There are two sizes:

• Standard Smart Track Foil rudder housings (Ski, Race, Flow, Original, Compact) (22mm shaft)
• Hybrid Foil Rudder housing  - longer insert (32mm shaft)