My DH made several (for me and friends) when I had a Bernina that did not play well with cones. He took a 5" round of a lovely hardwood scrap and drilled a hole partly into the center into which he put a 3" of 1/2" dowel, which he pounded and glued into place, then ran a screw into it from the bottom. At one side of the flat base, he drilled a tiny hole and inserted copper welding rod, about 12" long, with the end twisted at right angles ending in a pig tail shape through which the thread goes from the spool. Since this was from shop scraps, the cost was only a bit of glue and 1 screw.