Fixing broken mushroom pegs?

Hi, this is my first post, but I really need help. I recently got the Classics Deluxe Class Scourge toy and when I swivel his left arm on the mushroom peg it pops off. Does anybody have a fix for this? Thanks!
SEIBERTRON - Your Planet For Everything Transformers
https://www.seibertron.com/energonpub/
https://www.seibertron.com/energonpub/viewtopic.php?f=4&t=109594