I do the opposite of olddude. I put them in the freezer over night so the tar gets real solid and brittle. Then I clamp it in my vice bottom side up and peel the bottom off. From there the tar brick will almost fall out of the rest of the cover. Set the tar brick on the cement and a few taps from a 20oz hammer and the tar breaks almost cleanly off of the transformer and the rest of the mess is really easy to sweep up. No soft tar to deal with!
And of course I then go to work on the transformer for that nice #2 copper.
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