My samurai mikey had a warped/squished peg at the left elbow joint that was non functional so I contacted customer service and they actually sent me the replacement piece I asked for.
Haven’t swapped it out just yet, but I’m sure with some boiling water it will be simple enough, because when I first opened the set I dipped them in some hot water to loosen them up and they softened up so much that I accidentally popped Donnie’s bicep off and was able to pop it back on easily. That’s why I only asked for the bicep, elbow, forearm. I figured that would be easier to swap than the elbow. But they actually did ask me exactly which part I needed. And it arrived like 4-5 days after I sent the email, so that was pretty cool.