Solar Filter Holder for Binoculars

I've been getting ready to view and photograph the upcoming US total solar eclipse. This is a simple slide-on ring for retaining solar filter film on a pair of binoculars. It was designed to work on a pair of Bushnell 10x32 binoculars which have a 42mm diameter at the front lens tube. This could be made to work on other binoculars simply by scaling in X and Y to account for differing diameters.

Print two copies, face down on the bed as shown.

To assemble, carefully cut a piece of certif