Barry, I guess "Swinger" has ruined his eyesight also..., Best, Gil P.S. I've gotten back to the pushrod, rocker arm and spark plug design. The spark plugs are around 1.6 mm tall making them impossible to roll out of paper. I've resorted to turning them out of bamboo dowel..., I keep loosing the lot every time I sneeze or breathe to hard or forget where they're sitting and inadvertenly flip them all over the floor. Same goes for the crankcase pushrod seals which are nearly the same dimensions. This quickly gets insane..., maybe I haven't thought this thing out quite yet.