With stuck threads I usually thread a bigger piece into the one that's jammed and run electrical tape around the two for a bigger grip. Most of the time the thin ones are the ones that are hard to get. As far as lubrication goes I've tried a lot of things over the years and any grease will attract dust and gunk with dew over time. I found the best solution is to keep threads dry and run a HB crayon on it. The graphite seems to stop bidding quite well with a minimum amount of mess.
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