this made me remember the time at a HAncock store, 50% off notion sale. Lady checking out before me had a shopping basket FULL of thread, she had purchased two of every color they had. I could only wonder where she could store so much thread. And when buying thread at drugstores, food stores, dollar stores, sometime what appears cheap really isn't because there isn't as much thread on the spool. I'Ve been filling bobbins with serger thread lately and using them on top and botttom. I havent noticed any problems. I do need to pick-up a thread stand though! I'd like to know how you refill the small spools also. , but the bobbinsd work fine too.