Regarding the rod, the lowest gudgeon is supposed to be smaller in dia. than the others (three total as I recall). And the rod is machined down the last couple inches (small end first, dropped in from the top) so it fits the smaller hole and doesn't drop out. A pin of your choice goes in the tiny hole in the bottom of the rod to keep it from jumping up. I haven't looked at the rest of your question, but that's my answer to the first and I'm sticking to it... t
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