Original poster: "Godfrey Loudner by way of Terry Fritz <teslalist-at-qwest-dot-net>" <ggreen-at-gwtc-dot-net> Hello Robert There is no need to take the core apart. If you have most of the tar off, just place the transformer in a bucket and wash it with diesel fuel. Godfrey Loudner > I am un-potting for the first time and just de-tarred an Allanson 15/60 NST. > How can I get the core apart?