Here is a pic of the finished tool just before I drilled a 1/4" hole right in the center for a turning bar and then hardened the working ends
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Here is the cap nut freshly removed from the valve assembly. I'm not sure if it's the norm but it took everything I had to turn that nut out. The first attempt bent an ordinary 1/4 tool punch at 30 deg....Todd was a witness to the punch. I ended up hardening a piece of 1/4 drill rod to use as a turning bar.
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Then the tool is turned around and screwed onto the threaded stub on the valve. Wiggle and pull your guts out until the lead seals break free. And here is whats inside.

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