..and can't find a solution I posted here some months ago.
The OP had posted a camshaft and valves or a crankshaft and pistons (or maybe all) and couldn't get it to work.
I spent considerable time getting it to work - attached it here and the OP disappeared without comment.
I cover this topic during the Spring semester and thought it made a good example for the class to see if they could figure out how to fix the motion.
The more I type the more I remember how good a learning exercise this would have made.
I thought I had put the assembly in my class folder for future use, but now, months later when I need it - I cannot find it.
Searched and searched... ...no luck.
I am hoping against hope that someone else remembers it, thought it was a clever solution and downloaded it for reference.