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Most bolts are coated to prevent corrosion, you have to get thru that to get a good ground.<br />
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So removing a bolt that screws into a metal frame, you'd find a good ground on the threads, but not so much on the area around them or underneath the head of the bolt - which is where any kind of O-connector would make contact.<br />
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Easiest way to resolve is to use a small wire brush or similar attachment on a dremel tool to polish that area around the threads
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</blockquote>Yes, became obvious after about 15 minutes. Happened to look up whilst performing an upside down reverse pike with twist and saw the metal bracket....problem solved</div>