Here is a pic of the top end with the copper cylinder that holds the coil bobbins. It looks like it's soldered to the end disk. This too may be problematical. Not sure if I can unsolder this thing from the disk to attach the wire, and then how to attach the wire? MIG or TIG? http://i251.photobucket.com/albums/gg287/DogTi/R390A/filtercoppercyl_zpscf59576c.jpg