Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

My next casting was a demonstration for my brother's friend, and I learned lesson #4, which was use different size pins on either side of the flask.
The flask consists of the upper section called the cope, which is just an open box, and a lower section called a drag, which is also just an open box.

I made the drag mold, then made the cope mold, separated the mold halves, removed the pattern, and then unintentionally rotated the cope 180 degrees when I put it back on top of the cope.

Lesson learned again.
Trial by fire as they say.