not to say silvertone is wrong in anyway, but an easier way to do that is to---take your PUP wire and twist the end (as always) take your new wire and do the same, then twist them together, solder, then like bend the 2 at the base to the sides of one of the wires, then wrap it real good with electrical tape. the heat shrink way is a little cleaner but you can make this way turn out real nice also