If you are in South Africa, I would try the light taps. The rivet is solid, but it may compress slightly or even bend slightly, both of which would alleviate the problem. There are only a few thousands of an inch involved. The loose blade would be covered under warrantee anyway. light tap, blade closed, handle parallel, hit the rivet, backside of rivet on somethinfg hard like an anvil. If your in the US, send it to our customer serveice, they will take good care of you. Sorry for the invonvenience.
sal