Turn its flaws into pros

As others said, it's hard to tighten it up, but possible. Plastic ring comes off easily and it's actually good because it allows you to improve this sensor easily. The thing is, that sensor inside covered in foam which insulate the heat not in a good way. So, if you'll remove the ring, you'll see a stripe of foam that should be there to push the sensor against the metal wall of the fitting. Peal and cut the piece of foam that that covers inner side of the sensor, and stick it on top of the foam on outer side right above. Clean the inner side of the sensor with alcohol and put the drop of the thermal paste on the inner side. Then put everything back. Just make sure that you placed the foam peace (that you cut) correctly, so sensor is pushed well against the metal wall. Enjoy

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