Venetian Glass Jewellery Where Can You Buy The Decorative Covered Screw Rosettes. The Ones They Use In Antique Or Venetian Mirrors?

Where can you buy the decorative covered screw rosettes. The ones they use in antique or venetian mirrors? - venetian glass jewellery

I have a mirror in 1920 and several heads of glass are not the screw in the tip. He broke so everything you is ugly, without the screw top glass decorative. Is there a place that sells them?