I _think_ he is talking about he switch that causes the brake light to come on when you pull the front brake lever.... but I have been known to be wrong.
dont worry 64herald i knew what you was on about,why dont you try a hydraulic one ,it replaces the banjo bolt on the brake line on the handle bars then you just connect it up to the original brake light wires,sorry if you already knew this :wink:
i havn't done it on my rocket but i fitted them to my yamaha vmax on the clutch ,front and rear brake lines and they worked a treat,have a look on ebay or from a brake line supplier,just make sure they're the right pitch of thread :wink: