We just had our local sewing machine repairman as our guest speaker at our guild mtg last night. Wish you could have been there! He talked lot about thread, needles, tension issues...Some spools of thread are made to give up the thread from the top, others from the side. My pfaff has an upright post and a side mounted post to hold the thread. I think most machines do. From what I understand, unless you are making an heirloom quilt, it type of thread does not matter. Synthetic threads could outlive the cotton fabric, and also over time could cut into the fabric, since it is stronger. If I were you, I would just set that thread aside and use what works. Life it too short and you have too many projects to finish (if you are like me). Enjoy your hobby ; )