Shortening a mesh chain

I have a mesh chain that a customer wants me to shorten, and I’m not
sure the best way to go about it (or if I should even bother). I
thought I would pick some brains here to see what my options are. It
seems almost like the clasp finding is pinched on, not soldered. When
I checked Rio’s chains, it seems to be what they sell under item
#632-651. It’s certainly a more expensive chain (not like just a
simple cable chain or such), so it’s not that easy to just tell her
to buy a new one at 18", but then again to shorten it might be a
bunch of trouble & end up costing at least as much! Seeing how fine
the mesh is, I can’t imagine the trouble just to clean it up after
the work is done, assuming there actually is soldering involved.

Any insights or thoughts would be greatly appreciated!

Lisa
Designs by Lisa Gallagher