I recently had to deal with this also. the only thing i had here at the time was some metal washers-I put them up inside the cones worked great for a while. Not my finest moments in time, they kept falling out. I was gona go check for bigger ones that would fit inside but forgot. I had a cone holder and threw it away with empty spool not thinking. Why d ont they make them to sell also? Anyone who has electronics on there Machines--do NOT use the Plastic Cone holders--for some reason they make static? and it can mess with ur machine. I got tired of chassing the thread with it that i just made me one out of a coated hanger and a flower pot, works great till the thread get down to last of it then to light to stay in place....tall2