Catalog » EC12 Meter - Kits, Parts and Hardware Rudder Arm - Aluminum SKU/ID: EC12 Rudder Arm -AL $15.00 Shaft Size: 5/323/16 Short DescriptionThe CPM Aluminum Rudder Arm This CNC Machined Rudder Arm is available for use with different rudder shafts diameters 5/32" and 3/16" Custom Shaft sizes can be provided on request. Arm end is drilled and tapped for a 2-56 screw