I use those blue or white thingys that fit in the top of the thread spool to keep my bobbin and spool of thread together. A reinforcement circle used for notebook paper holes is used on the top of my bobbin to hold the thread end and keep it from unwinding. This would work in a bobbin box/holder, also. I like the idea of having the exact bobbin with my spool as some of my threads are so close in shade/color.