Rupp Roadster2 break switch

#1
Is this the right size of O ring for the break switch? This is not my picture, I stole it from Capguncowboy, thank you. I am working on mine and it does not have an o-ring 2015-02-18 14.13.19.jpg
 
#5
O-ring size...... what I did is got an O-ring that was about the same outside diameter as the plates, and a bit thicker than the dimpled part of the plates.

I found that I had two in my stash; a red colored one and a black one. The red one was softer material and when the brake lever travel was adjusted , was too soft and the brake light came on just moving the handle bars. The black one, a bit harder and worked ok.
 
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