Hi Hubie
I think you mean between the Dynamo Drive sprocket, and the casing which BSA-Bill & the Draganfly BSA catalogue show as 67-0708, so we agree with you
For A10 Boy: Yes the crancase breather was thoroughly cleaned out and was rechecked a couple of days ago
I could not see how the cork seal, with one face pressed against a non moving crankcase, and the other against a moving sprocket could survive, but I have one on now and looking hopefully forward tooil free shoes and silencers.
Once again, many thanks to you all
Roadrocket649