| Heating metal makes it expand.
Spray a little WD-40 in the gap at the top of the thread and let it sit for half an hour, then spray a little more then wait again then try.
The WD-40 will work down and lube it up nicely. It also wont do any damage to electrics though I wouldn't go pumping it into the capsule. Also, I take no responsibility for anything. ;)
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