Hello: I am helping my husband out with a question that he has on the exhaust flanges that he purchased for the new exhaust system he is putting on his 79 Honda CBX. The flange remains loose when it is put on the pipe. I contacted the place that he purchased the flanges from and they said he must be putting it on the wrong way as the flange should fit tight? I wondered if anyone had an answer? Thanks very much. Cathy