Unfortunately I cannot help but would also love to get some intel. I have a Bristol 47.7 and have also had some leakage around the rudder
stuffing box, but only under power when the transom squats a bit. I tightened the nuts on top of the box a bit but haven't had a chance to see if that helped. The next step would be to replace the flax at the next haul-out, a job which looks like it requires removal
of the quadrant to gain access. FWIW, mine is an Edson
unit and I thought I'd contact them re: sourcing a new steering
cable/chain while I was at it. I'll post any useful info.
Any other Bristol owners or knowledgeable folks out there?