Sterling silver earring posts readily bend after being
acetylene/air, easy soldered onto the back of the earring
One easy trick is to grasp the post, once soldered on, near it’s
tip, and twist it. Twisting doesn’t thin or thicken or lengthen
the post, yet will work harden it. Just be careful not to twist
so much it breaks off.
The vertical twin silver posts (that hold the swivel bar)
in a cufflink single unit finding, softens following
acetylene/air easy soldering. When the wearer of the cufflink
leans on his wrists they will bend unless hardened stiff.
You can often hold the finding in a heavy soldering tweezer,
keeping most of that post from getting hot enough to anneal,
especially if you’re using an oxygen/fuel torch. The air
acetylene torches make this harder to do. My own preference is
to use a different type of finding which prevents this problem.
I use the cufflink backs which include a small swivel right at
the base of the link. You only solder on that small swivel,
which looks only a bit larger than a pin joint finding. Then the
rest of the link finding is rivetted to the swivel. It never
gets heated at all. This type of finding also lets the cufflink
ride against the shirt cuff better, as the link is free to find
it’s own best position, and if leaned on, the link just moves in
it’s hinge, not actually bending…
Hope this helps.