Don't know if it's been noted... But
I noticed this morning I'm not getting as much vapor out of a freshly charged battery.
I was all set up to wrap a hotter coil,
I went to loosen me post screws and noticed they were both loose.
I tighten both of them now it's rocking again.
The heat will loosen them over time.
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I assume this would apply to other similar rebuildables.
Thanks for the info.