Hello everyone. I thought someone here may know a solution to my issue.

Problem is:
My GBA-SP's B-Button is broken. I guess it's the rubber between button and contact, or the button itself. It just doesn't work anymore. I cut a little circle into a small piece of paper and i put it in between the button and the rubber, this slightly improves the issue, now it occasionally works, and if it does it often triggers multiple times which is undesired.

Does anyone know a quick solution to this? I may order a broken SP for spares to fix it next month, but i would really like to play, so a temporary DIY solution would be a very nice thing.