I think we nailed it !
A #8 Ateco cake decorating tip is the perfect size to punch the hole for the minus button
After you cut it all out, put the button in, and gently insert into rDNA while holding the plastic back a little.
Trim excess and put door back on.
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Great work Jake. Now make a actual sized template, so everyone can cut one out. A downloadable .jpg. To cut out the hole they can just fold the template in half and cut out a semicircle