Insert for 22mm plastic eyeball

I use these 22mm eyeballs for decorations, props, etc. - but since they are hollow and half an eye, they need a way to mount them. I created this - it's basically a 19.5mm sphere, sliced where needed, with a 1mm flat extrude on top as reinforcement and a base to work with. Simply push it in place - you'll hear the layer lines (.20mm) lock it in place. You can add some super glue for extra grip, but I've tried twisting them out with pliers and broke the part before it came out. There's a hole to thread string, thread or a small tie-strap.