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How to Use an UNO Shade Adapter – Antique Lamp Supply
Vintage Hardware & Lighting - Glass Shade Adapter 2 1/4" Fitter Up To 3 1/4" Fitter (ZV-893DK)
7 8 9 10 inch Lamp Shade Harp Holder,Adjustable Lamp Harp Kit,Fit both Standard Lamp Rod and E26 Light Base UNO Fitter Adapter,with 2 Shade Attaching Finial Top,Black Horn Frame Lampshade Br -
2-1/4 Clamp on Shade Fitter Adapter in Solid Brass Shade - Etsy