>> Soldering the plugs is never easy.  Not only are they small, but the 
>> stainless finish on the tags often resists bonding with solder.  It can 
>> take a lot of heat and time with the iron to get a metal bond.  By then 
>> your cable insulation is damaged.
>
> You can scratch the tags finish with a cutter blade before soldering.

The key to soldering this sort of thing is to use hollow core
solder with acid flux, or use paste flux. It doesn't hurt to rough
it up either, or to tin the end of the wire with solder first.

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