Making Ball Shells Using Plastic Parts In this article I am going to describe a way that I make 4" plastic ball shells. I want to emphasize the "One Way" part of this article's title, though. In Volume 2 of Bill Ofca's Technique in Fire series, Design and Quick Assembly of 3, 4, and 5 Inch Plastic Ball Shells, some interesting and useful methods are described, and it was this booklet that I followed when I first started building plastic ball shells years ago. Lloyd Sponenburgh has another way of building these shells, as described in his Passfire.com article, 4"...