A simple fix.

For the first time in years I had a fiddle with my little ear and nose hair trimmer, and it was very iffy.

The connections may have wanted a slight tweak but when I touched the copper one it broke loose.

Press the soldering iron into service and do a quick melt into the plastic.

It works fine again now, I should use it more as it does a fine job with less care than using hair clippers in those hidden places.
Hair, the curse of aging.