Replacing Moen 1248 Cartridge - retaining nut stuck

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Raleigh, NC
Due to a faucet leak, I'm trying to replace a Moen 1248 cartridge. Moen sent the part and instructed on using the 14272 removal tool to remove the retainer nut before removing the cartridge.

However, the plastic retainer nut is extremely stuck. The 14272 tool was useless for this job. It just stripped the plastic. I've saw some advice to jam a chisel in there and twist. All that did was remove the inner layers of the retainer nut. The outer part of the retainer nut is still stuck on the valve and not moving.

How can I get the plastic nut to separate from the valve threads without damaging the valve? Appreciate any advice.
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