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Mike Barry at Mariposa used to build his randonneuse framesets with the seat lever to BB generator setup back in the 80s.
The activation wire could be internal or external in routing.

There is a period Mariposa brochure here that shows the details of the braze-on BB generator mount and a photo of the installed generator and seattube mounted cable actuation.

Bertin used to do the BB generator but without the seat tube mounted lever on its C 134 Audax models.


There was a possibility of tire slippage on the generator roller in wet conditions which meant some people wrapped the roller with tape or coated it with an abrasive material to minimize slippage. The maintenance must have been a horror.