This is machined out of aluminum. We will have mechanical drawings available during Fall 2020. We also have drawings of a 3D printable shell mold for making molds that drop into this. And methodology for printing the outside contour of pieces to be jiggered. These will all be available soon.
2020 Project to Document a Shimpo Jiggering Attachment
Make your own jiggering attachment for your potter's wheel. Here are the plans and lots of help to get your going with molds and techniques.