You can see at the top circumference of the cylinder head the sealing area with the Jug! We call the Piston Cylinders, "Jugs". We call the pistons, "Slugs". Old Harley Davidson lingo! Basically the same things! I was a frustrated kid and always got snap tite wreckem models. You could snap them together, run them into a wall and they would all fall apart! Assembly time once again. Same with my lawn mower motors at 7 years of age!
