The ivy is really amazing, but I reckon it is in danger of pulling the capstone down altogether.
Image credit: ryaner
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Wow, it just gets stranger looking as time goes by! Must be six year since I was here last, overdue a visit.
Your fieldnotes say July 2005.
Ivy? A small hacksaw. Remove the main stem/trunk a short section at a time. Let the rest of the growth dry out and die back.