the tool you’re thinking of is the ONA Puller. I have one and it is incredible for pulling moen cartridges. Cartridge removed in no time with no struggle. It’s actually on amazon now. It wasn’t when I got it. @bawalter is the one who makes it.The shell of the Moen cartridge is still stuck inside the shower valve body.
The old dried up rubber seals and corrosion practically weld the cartridge to the valve body.
So when you yank on the stem, that is all that comes out.
This is an occasional problem when trying to extract that cartridge.
There are Youtube videos on how to build a home made extractor to get the shell out.
There are also tools available just for this process.
A member on here had a company that made a nice looking tool for this job, maybe someone can dig up a link.
I will look for a Youtube link to a video.
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