This was a full teardown and rebuild of the ShopSmith jigsaw. It looks like a scroll saw, but since it has only a tensioned spring instead of a walking beam (to pull the blade upwards), it’s really just a glorified jigsaw that breaks blades and leaks oil.
That didn’t stop me from trying to replace the gaskets.
A set of cheap hole punches did a very good job on the gasket material.
The finished gasket is a good fit.
Even the smaller rubber-washer-style gasket came out well with just the punches.
It all came to nothing though. The machine creates a fairly strong vacuum and (alternately) pressurizes the oil chamber, which forces oil out of the seal.