I have a Mark 1 with the standard coil and the 10 1/2". It seems the coil wire on the large coil has broken where it enters the coil (just inside the coil I think) Is there anyone that specilizes in coil repair and maybe could repair this coil wire? I get good depth with the standard coil but I'd like to have the larger coil for the additional depth I think I'd get.Has anyone tried to repair their own coil? I' appreciate any help you guys can give me.