rivet

Looking at the Yamaha Parts catalogue, the chain guard seems to be retained by two screws and two rivets. Are these rivets re-useable or do they need drilling out and replacing?

About to fit one of these huggers. anybody fitted one,? existing "hugger" seems to be attached to right swinging arm by some sort of rivet ,cant quite see as I haven't taken wheel out yet,if it is a rivet best drilled out?Regards BrianJ.