How do I remove the loop button?

I recently bought a rear housing replacement for an iPod touch 5 (with rear facing camera) from eBay. Unfortunately, the housing did not come with the silver Loop Button installed... And I am having trouble taking it out from the old housing. I was wondering if you by any chance sell it, or maybe can help me figure out how to remove it from the old housing. I'd greatly appreciate any help. Thank you for your time, can't wait for a reply back.