I built Harold's engine back in High School (1981) when he was my Vocational Technical School Instructor. Mr "D" as we called him, taught me more about metal working than anything I've learned or experienced on the subject since! He is a Master of the metal working craft and his Hit and Miss engine is a prime example of his skill.
Here's a picture I took of my engine in operation:
http://www.steel-crafters.com/images/stories/dsc00066.jpg
BTW...Does anyone think there would be an interest in casting parts for this engine? The body, head, flywheels, connecting rod, and cylinder could be cast and would cut down tremendously on the build time. If there's enough interest out there, I will proceed with my plans to build castings of this engine.