As a good friend of mine would say “This looks like a job for 3D printing!”.  I recently acquired a bandsaw from my father and in all the confusion and commotion I seem to have either forgotten to package up the knockout for the blade or I simply lost it.  To be honest I am not sure which is more likely because they are both very likely.  So I decided that I could simply take a few measurements, then design and print out a replacement.  I think it turned out well.