I'm here, just 1150 miles away and just been for a five mile cross country pedal cycle ride in 37 deg temperature to try and move some of the adipose tissue around. I would try to give you more details when I am back but it is not a simple system. If it is the same as the one I have then there is a cable from the handlebar down to a very small and neat master cylinder mounted on the bridge plate across the front of the fork legs. This gets round the problem of having a master cylinder up on the handlebars and it fouling the fairings etc. I remember Roy telling me about this many years ago when I was visiting him and he had sourced it from Automotive Products, now AP. I can't give you part numbers until I am back. If you want more details then you could ask Roy, assuming that he is well enough. He was not into Vincents for money and he will have no secrets but I think you will find that some of the parts were designed and made by Roy. It should also be noted that there is no provision for a speedo drive in the front. That is taken from the rear wheel and is one of the reasons that the front looks so neat.
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