How to secure L and R bumpers so they don't fall out?

[Pezmir]

My L and R bumpers were knocked out of my MintyPi Lite and I was wondering if there was a way to secure them in better?

[Bush Master]

You could make the ring at the end of the button bigger. Make sure the black part is still going to touch the contacts on the board. You could use card stock and glue it on.