If you ever hear a rattling inside your Pop figure's head, it's likely this - a loose plastic disk that was left over from the manufacturing process. : r/funkopop
Funko Pop! vinyl figurines are a $686 million dollar business - Vox
How to fix the head of a Funko POP Bobblehead - YouTube
Funko Pop! Star Wars: Return Of The Jedi: Jabba's Skiff - Luke (target Exclusive) : Target
Comedian Viet Custom Toys on Tumblr: Here's a quick way to turn a bobble head Funko Pop Vinyl into a regular one. Unscrew the spring from the peg. You can then take...
How to (Actually) Legitimately Fix the Head of a Funko POP Bobblehead - Clean, stand, buy, etc - YouTube