I took Eric's idea and ever-so slightly tapped the tube's bottom end and 'oval-ized' it a tad. Having do that I'm off to Ace Hardware tomorrow for a O-ring. I'll also apply a tad of RTV as necessary. I looked closely at my old engine picture and noted what appears to be an O-ring.
Reference the leaks. It all seems to have been from the area at the bottom where the block meets the tube. No evidence of any oil coming from the cap/air breather. BTW I noticed that I never replaced the old 'brillo' like material inside the cap. Is that really necessary?
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