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. The piston rod was left ribbed. It was cut with a radiused grooving tool and stepped over regularly. I liked the pattern it left, so I kept it. I’ve soldered the parts where Mr. Pete used loctite on his. Part models can be seen here.