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

I think you mentioned that you got some of the material for making gaskets...

Here is the gasket material I've ordered in the past.

https://www.amazon.com/gp/product/B00068OLEC/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

As the mandrels on Mayhew/Boehm punches are the same size for metric and imperial, you can mix and match cutter heads from both sets to get more size combinations.