Airportable: I didn't keep them only the photo which I thought might be useful (it was), re pistons for years I had a cut down Ford (Escort?) one as a paperweight, someone (not me) whilst working on the carb unknowingly dropped the ball bearing in the carb down the inlet and wondered what the noise was when they started it up. When we got the piston out it resembled the surface of the moon with a shiny ball bearing stuck in it, I thought it was a thing of beauty and kept it alas my mother was of a different opinion.
sworkscooper: according to the dictionary a "pearl catcher" is an outraged woman, who wouldn't be after being stuffed in an air vent? although I suspect a different meaning here.