The Saddle Rider brand M-10 Threaded No-Slip Rubber Endpin Ball - fits Saddle Rider and New Harmony Brand double bass endpin tips, as well as others, which use a standard M10 thread.
I like the rubber endpin ball because it does not slip on the floor. I purchased two of your threaded model, hoping it would fit both of my basses. It was perfect for my Framus bass, but too small for my Alfred Stingl. So then I bought the unthreaded model, which was too big. The good news is that I can stuff the hole with carpet tape or some similar material and make it stick to the endpin.
Fiddlershop is a small family-owned business located in South Florida. Since 2012 we have been serving the string community with quality instruments and accessories. We believe that music and instruments should be accessible to everyone at a price they can afford.