Andy, Bill, Bob, you caught me
. I can't argue about the quality of good, well-temperated Ale, I might have enjoyed one or the other glass during visits to your country already...
But I have yet too find something you can legitimately call "coffee" or something that comes close to our dark leaven bread. But that's another story, when in Rome...
Back on the topic: I'm not sure whether anything that will be good for a rear chain will suffice for the dynamo, at revs up to say 3000 or even 3500rpm on the intermediate gear, low melting point grease sounds like the best idea to me. It is also a matter of transporting heat away to the cases, just like on the primary chain, which the then liquified grease should be capable of.
Btw., even at good lubrication, I have noticed an alarming rate of wear on what used to be high-quality Renolds chains. Could it be that they aren't what they used to be?
Best, Markus