M42 lens adapter aperture pin pushing ring

So, if you have an M42 lens that has automatic aperture pin but doesn't have a manual toggle, you might end up with the lens never closing when on an adapter (or with a camera that predates auto aperture pins). If there is a long enough thread on the adapter or theoretically camera, you can print this 2mm thick threaded shim that will push the auto aperture pin in. I used it with Tilt-o-matic and whatever M42 to EF adapter I found.