Hey Joe, I have an arm like that but the flash around the arm is completely ripped off (not like yours, which is still attached). any suggestions?
Chad: I think you might be able to pull off what I did using foam. However, maybe try cutting the foam into an hourglass shape to use as a stopper since the flash is completely torn.
Very clever fix, Joe - that figure is definitely "sponge-worthy"!! With the concern over the foam rubber deteriorating and/or becoming gooey, you could first wrap the foam in a piece of saran wrap to contain any such mess.
