I have been toying with the idea of casting a Ball Hopper Monitor hit and miss engine, like the one Myfordboy cast, but larger. Here is a guy (UncleBarn) who has apparently cast a full-sized Ball Hopper Monitor muffler and hopper. In the first video, I would have used perhaps two gates, and made them wider, almost like knife gates, with perhaps a U-shaped runner (with dead-ends on each runner) around the part at the centerline. His sprue and gate look way too small. In the second video, he mentions that he made a "mold" for the water hopper, but I think what he meant to say is he made a "pattern" for the water hopper, or perhaps he is pointing to the original hopper on the left side? His verbiage at that point in the video makes no sense. The above videos sort of beg the question "Could a full-sized engine be cast in a backyard setting?" Here is a portable boring machine that was used to bore his engine. This would solve the problem of not having a lathe large enough to bore a full-sized engine. Myfordboy's Ball Hopper Monitor pattern and casting videos are here: (I watched these videos randomly for several years before putting two and two together (yes, I am a little slow) and figuring out that he had made a Ball Hopper Monitor (from scratch; quite an achievement). A bit of a needle in the haystack, but perhaps I have links to them all ? Part 1: Part 2: Part 3: https://www.youtube.com/watch?v=Dt2mqlwMyZU Part 4: https://www.youtube.com/watch?v=zPgD9hFIhSA Part 5: https://www.youtube.com/watch?v=1O1M1kaZlFg Part 6: Related to green sand conditioning only. Part 7 (is this part of the Ball Monitor Engine?): https://www.youtube.com/watch?v=5KbHX2LKf9w Flywheel (I am assuming this is one of the flywheels for the Ball Monitor, or perhaps not): https://www.youtube.com/watch?v=m_-iPpEuWRA Cylinder (Boring the cylinder): https://www.youtube.com/watch?v=H0_6VmY6mns Assembly: https://www.youtube.com/watch?v=UnxCaB1ID8I A 12" flywheel pattern for another engine, but perhaps the same procedure that was used for the Ball Monitor flywheel pattern: https://www.youtube.com/watch?v=-sQCJ6rv54s The engine running: (What a fantastic engine/pattern/casting build !): https://www.youtube.com/watch?v=Yeu9zdullZ4 Did I miss any videos?