Possibly this is similar to the component you are seeking. It is
advertised in BeadWork Magazine in some older copies I purchased from
Nicole. The component allows you to change the beads on your pendant
and has a screw on top with a loop. It's called Change-a-Bead Pendant
and is from Beth Willaims Studio, 17 Pleasant St., Gloucester, MA
01930
www.changeabead.com
Fax: (978)283-5589
I hope this helps. I haven't checked this out though.
Lilyflower