I just recently had a problem with the bobbin in my DSM....the bobbin would rattle -- I could hear it bouncing when I sewed. Remembering the Little Genie washers and having NO desire to drive 30 miles one way to get some, I improvised. I use the M size prewound bobbins on my longarm. The prewounds also come in the L size (for your home sewing machines) and have a lightweight paper on the outside --- just like the sides of a regular bobbin. I cut one to fit into my bobbin case and VOILA, no more bouncing bobbin. If you see any prewounds at the store, buy one -- they're very inexpensive and can be used for more than one thing!!!