I'm not sure this will help, but I do a lot of crucifx repairs for a
local monastery, The Sisters of Camel. To help fund their church and
Monastery they run a rosary repair and sales business on the web.
They may be able to supply, or at least direct you to their suppliers
of, rosary parts. Their conact info is:
The sister I deal with most is Sister Veronica.
Hope they can help.
Paul D. Reilly
The Paul Reilly Company
Colorado Springs, Colorado