Good idea with the pigtail. So - if I understand correctly - the issue with a solder filed section of multiple strand wire is its shape which could result in it becoming loose. And this looseness would cause poor connection. If the wire cross section happened to be an oval then if it were inserted with the flattest side on top and bottom it would be unable to ever twist due to the pressure exerted by the screw. In which case it should never become loose and cause a problem. I'm just thinking out loud to understand this issue.
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