OK, Well I have had two call makers turn calls out of the Norplex and my Westinghouse. They did not have a problem with either. They were not sure if the Norplex would work but they said it turned the same. You can not tell the difference between my four original RNT calls and the ones made out of my Norplex and my Westinghouse. You may have used the wrong grade. Best of luck in your search.