So far she has been adamant that she does not want any
modification of the ring such as changing the shanks etc..
Alma, many years ago, I recall being able to get a sort of two ring
clip that did what your customer wants. A small curved piece of sheet
metal went inside the shanks of both rings at the bottom, covering
just the width of the rings, and being perhaps a quarter inch long.
it had a small hole drilled and threaded at it's center point.
Another curved piece of metal, this one with two grooves shaped into
it's inside surface and another, undrilled hole in the center. The
rings were placed onto the smooth plate, the second grooved plate
put on the outside, and a small screw that went from the outside,
between the two ring shanks, and screwed into the inner plate, held
everything together. The outer plate was shaped to come around the
sides of the shanks enough so the shanks could not twist out of the
clip. These held a wedding set together without any modifications to
the rings. But it wasn't a simple slip on, slip off clip. You needed
to at least be able to work with a tiny screw, roughly the size,
only shorter, as most eyeglass frame screws. Not all customers are
willing to fuss with that, much less able to not loose the screw when
the clip is loose.
I haven't seen such a clip for sale in several decades. But the idea
is still sound enough, and if you wanted, you could make such a
thing. But given the fuss of putting it on or taking it off, it's
hardly a make up your mind each day whether to use it or not. It
would be easier for your customer to just use a bit of flexible
band-aid type tape to hold them together. Works for high school
girls, why not the older ones too, especially when they're being as
fussy and hard to please as any junior high school girl trying to
stick with her clique's fashion statements of the day...