Gas Cap Door Won't Close

I know this might seem petty and I don't even know if this is the right spot to post this question but... has anyone had a problem with there gas cap door not closing due to a little rubber gasket breaking off the post that the door snaps shut on? If so how did you fix it?

Yep, had it happen to me. Replacement part is $20 at the Chevy dealership and about a 5-10 minute fix. Until I fixed it, I would push the "plunger" all the way in and close the gas door really fast

ditto for me. cheap part easy fix with phillips screwdriver