[radiohenry]

On the last 20 that I refubished I put the large filter block can in a slow cooker and heated it up slowly. Not too hot ! Just hot enough to soften the tar but not enough to melt it.I had left the leads in place and pulled on the leads with pliers while holding the can and everything came out in a lump.It appeared that the can was lined with I don't remember exactly what was used for insulation but after pulling out a couple of leads it all came out and the can was very clean inside.
                                 Henry