The first time is a bit of a pain, but it's easier to do after that. I've done it one 5 or 6 of my vintage figures
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I let my toddler play with my MOTUC figures last weekend. I think I'm more satisfied about the durability of the Classics line, EXCEPT he somehow managed to rub a lot of paint off He-Man's power sword, I think because he flexed it a bit. That metallic paint seems to just flake off.