PolyDryer cereal box dual-port adapter alignment tool

I wanted to make it easier to cut new hexagonal opening for PolyDryer Dual Port Adapter by @SparrowHawk_421862 (thanks for that design!). Original model has alignment hexagon template, but you need to position it carefully and secure it with tape to trace and cut. This gets tedious with more boxes and is prone to errors.
 

This model makes the tracing process much simpler:

• Put it in the existing round opening in the lid (on the “outside” of the lid). Don't have to push it all in, just so the long connector and the hexagon is flat on the lid.
• Make it more or less parallel to the longer edge of the lid (doesn't need to be 100% perfect, it's just aesthetics)
• Trace the opening on the outside edge of hexagon with a sharpie
• Cut on the inside of the traced line, like the original instruction says here