looking over some of my old posts...it looks like at one time I had the Wilson 710 and also a Whites 4900. I tried the 4900 coil on the Wilson. from my notes and from my recall...it worked good in all metal.....not so good in discriminate. this may help those who have a Wilson with coil problems. just use it in all metal. and maybe? get one of those pin pointers that has discrimination capabilities.