Clip-on Adapters Mounting Standards - Optics Trade Blog
Clip On Lampshade Adapter - Includes Finial and Lampshade Levellers to Keep Lamp Shade in Place - Light Bulb Clip Adapter for Lamp Shade - 1 Pack - Walmart.com
22/28mm Motorcycle Clip Ons Fork Handle Bar Handlebar Clipon Riser Clamp Adapter | eBay