I thought I wanted a cone thread holder but couldn't find one locally. I tried a big cup behind the machine but had concern that time would wear away the finish on my machine as it fed up and over. My machine has the capability of having a regular spool of thread either vertical or horizontal. There are 2 flat pieces to slide over the pin if using it with the thread horizontally. I'd seen the deelybob adapters online but noticed that I had an empty YLI invisible thread spool ready for disposal. AHA!! Put the adapter upside down on the vertical pin, then the empty spool and then then the cone thread. The cone fits perfectly inside the adapter and I don't need to mess with something else around my machine! Love it and the price was right--NOTHING!!!!!