All good advice above. “Tin” the pill with no driver or LED in it so you can get it hot enough to make a little patch of solder on the rim (careful, it will flow like water on truly hot brass, have some near boiling water handy to drop the hot metal into and the flux will practically explode off leaving it fairly clean, otherwise you may need to dip the whole thing in vinegar and hydrogen peroxide (50-50, 10 minutes) for a while and scrub oxidation off everywhere.
Or file notches in the retaining ring, and pre-backwards-twist the wires so they untwist as you turn the retaining-ring-and-driver into its threads to tighten it down.
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