The only way you will ever get the nut tight enough to completely seat the sensing bulb is to use a flare nut wrench (tubing wrench, line wrench, whatever you call it) to tighten it. You will surely round off the corners of the nut if you use a open end wrench. I have had to remove the battery box in order to get a good grip on the nut. I have contemplated taking a 5/8" deep impact socket and cutting a slot in the side of it for the capillary tube to pass through and trying to tighten the nut with that but I've never got around to making it.
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