Niche part for a pretty rare VO&S spinningwheel. The spinningwheel was designed and built by Bastiaan Vos (of Clickets fame). It has a few custom parts that aren't available anymore (or perhaps never). My spinnewiel was missing one, and the other broke off.

So, if you have a VO&S spinnewiel and want better flight eyelets, then print 2 of the eyelets and a bushing. Because the original eyelets where made of steel and these are printed from plastic, you must balance the flight with a few M8 washers (see photo). If you don't your neighbors will remind you that you must.