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Way to go Pete. Depending on how brittle that rubber became over the years, the rest should be easy. Tedious maybe, but easy,

I used penetrant overnight. Mouse milk is my personal fav, having never tried kroil.
Also immersed the head only, in boiling water for 30 seconds before torquing it with the opposing strap wrenches....

Hey Pete. Take the time to get it unthreaded to get the original knot out cleanly.
Use penetrant, strap wrenches, etc to get the original threads working again.
Once apart you can attack the...