Originally posted by HoutHans Actually, some anchors will have these extra 'booms' to help them dig in, so it may not be about preventing theft.
Something new to stuff into the vanishing spaces of my memory. Actually, new space is opening as things I used to remember drop out. Seriously, I never heard of nor have seen a stockless, admiralty or fisherman's anchor with such an extra bar at the crown.
You must give me a reference or website if you are able, showing an anchor with such a rod through the crown. My own searches for anchor designs failed to turn up an image or description of such a modification.