Pawbler reducer / difficulty modifier

Motivation: I got the Benebone Pawbler for my pup. It's a great concept, but the size of the opening is quite large, and so dispenses too many treats per “push” for my miniature dachshund. So I designed a simple reducer ring, so the toy dispenses treats less quickly, which results in her playing for longer. How to print: Should be a flexible filament. I used “TPU for AMS” but something even softer might be even better. How to use: Use an adhesive that is flexible. I used E6000, but I am sure others would work. Note that superglue (cyanoacrylate) is not particularly flexible, and hence not a good choice here.