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I can't figure out how to post photos here so I put one at the end of my 2015 journal at http://www.public.asu.edu/~icrjc/Narrowboat/Summer15.html
Page down to the last photo on the journal and click to enlarge. The strike point is arrowed at the bottom of the swan neck. The fitter hit it so hard it deformed the metal. "Helped me with my anger management problems no end", he said.
OK. I forgot to mention that it's a good idea to soak the brass collar bearing cover with WD40 the day before to help it slide up when you hit the swan neck.