On Fri, 25 Jul 2008 07:13:26 +0700, Bruce in Bangkok
wrote:


When you think about it the two washers and bolt idea is perfectly
sound. I have a "ground plate" bolted to the side of my fiberglass
boat using exactly the same technique.
//
Bruce-in-Bangkok

In my view, less than perfectly sound. The problem is a glancing
contact that wipes off the seal and bolt - when you least need the
added danger.

Brian W