If your valve stem turns when you try to unscrew the TPMS sensor, wouldn't it be leaking? I don't see how it could keep a seal if it was loose enough to turn by hand. Or is just the extension turning? If so, then you could unscrew the extension and the sensor together, then it should be easy to separate the two.
I also use EezTire TPMS system. I haven't had any problems with it, but I don't have extenders on any of my tires. I do have rubber valve stems though.
For labor charges to fix your issue, it should be just a dismount and remount fee. Probably just a nominal fee since it's not really a lot of work.
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2014 F350 DRW 6.7L CC FX4 King Ranch Ruby Red Metallic 158,000 Miles 4,450 Hours
2018 Cherokee Grey Wolf 29TE | Because I'm home, no matter where I am.
2018 Honda CB650F | Because the truck leans the wrong way when I turn.
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