Cake pop mold with Plunger

Heyyyyyy, I’m trying to figure out how to make a cakepop mold with a plunger. Any advise is greatly appreciated.

good morning, I’m trying to make a cakepop mold but, I’m having a hard time with the sizing of the hole. I didn’t change the size, I only change the color of the file if that makes sense. Any help is appreciated. TIA