Are any of your concho type items available with screw backs?
Guyot Brothers makes a small variety of conches, which can be assembled with screw-backs, however, that is not a service that we offer. You will find at this link a list of jewelry soldering companies that may well be able to provide you with this service.
If you would like to see a sample of a few conches as is, please let us know
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508-222-2000 Fax 508-222-3011 Email firstname.lastname@example.org