I have a job to repair a locket that's made out of what looks like a Mexican
I've managed to rebuild the locket and remove the lead solder but, the lead
solder flux has eaten up the springs in the catch. Also the catch is one I
never seen before.
Difficult to tell. Is the spring really in the catch? Usually it
is built in to the hinge or under it. If the hinge consists of
an even number of pieces (4 or 6 tubes), there could have been a
torsion spring inserted instead of the hinge pin. This would be
made of two pieces of flat hardened spring steel with an
elongated-oval cross-section, running the whole length of the
hinge. They are inserted with the lid closed, and at one end, a
silver wedge is pushed in tightly to lock them in place. The
other end of the springs is wrapped in a bit of binding wire and
twisted with a hand vise until the desired tension is reached.
Another wedge is forced in at this end of the hinge. Unlocking
the catch the lid should - well, spring open. The wedge material
should be work hardened or one could use nickel silver.
Of the othe kind of spring which is fastened under the hinge, I
don't know much, perhaps you could look at a pocket-watch.