Ness-Tech Rebuilt Kit for 5/8 Handlebar Master Cylinders
Source: Custom Chrome
Two distinct designs have been used in Arlen Ness® brake and clutch master cylinders. Master cylinders manufactured through 1993 have a straight spring and no identifying marks on the body. From 1994 on, they have a cone-shaped spring and REV C stamped on the body where it mounts to the handlebar.