Ian
Thanks for the comment. I hadn't thought about the muffler being bashed, I'm an effete modern day WM20 rider who sticks to the roads.* I was thinking mostly about water ingress issues. And as you say, every little bit helps.
*The bike gets some use on paddock patrol on our small landholding, but that 'aint off road, is it?
If I recall correctly there is a small hole in the underside of the M.20 silencer (muffler to those across the pond) and I always assumed this was to allow water/condensation to escape.
