Mr. Pete’s Mayonnaise Jar Engine individual part models and pictures of the finished engine. The engine is sitting on a 1-2-3 block for scale. 1/4 inch bore by 3/8 inch stroke. The whole engine stands less than 2 3/4 inches tall. I strayed a little from the original. My flywheel is knurled and grooved and the base was made to match. I’ve soldered the parts where Mr. Pete used loctite on his. Pictures of the finished engine are here.