"(PeteCresswell)" wrote:
Has anybody got a technique for replacing the plug on, say, a set
of iPhone ear buds?

I've tried this in the past and failed because the wires are so
fine.

the last ones I dissected were made with bundles of fine wire, sort of
like litz, but unbraided. You can just burn out the fibers mixed in with
a soldering iron and fresh solder. Keep your face away from those fumes.