My efforts got the stem/core out, leaving the cartridge body behind.
I used a screw/bolt extractor tool, sized for bolts 5/8 - 7/8", itself 1/2" at the stem. It went in with a half-dozen hammer taps, and I was able to twist it out with vice-grips. It took me maybe two minutes; the tool was $10.
Well it happened to me at noon today. Tried to remove a 1225 cartridge and the stem came out leaving the core in the valve. I called my favorite plumber who showed up 2 hours later.
He used a easy out spiral extractor, a few taps to set it then broke the core free turning the extractor with a big wrench. Out it came.
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