Are the tines stripped? Are they metal? Might try some kroil and let it sit for a bit.
Based on your plan, just getting it out seems to be the plan. I assume they were installed based on the threads unfortunately. Which means the reverse of BSA threads. You’ll have to loosen the DS to the left and the NDS to the right I think.
Thats crazy that the resistance wouldn’t have convinced the installer to stop.
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