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Solder Sleeves, do you use them?  I have not used solder sleeves although I know many do.  I do not trust the connection and cannot understand how you have any idea if the solder really joins with all of the wire strands?  I have soldered for many decades and have seen the good, bad and ugly with flux, cleanliness, wire types etc..  My recent experience seems to validate my opinion.

Never tried them, but doubt I would. With my electrical background we do not solder anything. Only time I solder something is if it’s on a board or electronic type stuff. Everything else usually gets a mechanical crimp connection.