Many thanks to Whites for their top notch repair dept. They turned around two of our P.I. Pros in ONE WEEK.. only charge- $10 ea for shipping... I wore the coil through on the bottom - not their fault. The machines (non-weighted type) now have a new coil, with "ridges" radiating from the center to the edge, and NO FALSE signals when the salt water runs over it!!!!! Hurraaayyyy