I am not sure how the larger spools work but I have a number of the smaller ones here as I have on occasion had to take them apart in an attempt to make them fit my spool pin. I usually ended up using a piece of felt to get the right depth and dimension. On many of my larger spools I will put them sitting at the back of my machine. I discovered that Brother's makes a part for some of their 1500 model machines that manages to fit into larger spool and inserts into to the bottom and will allow a larger spool to sit on to a regular spool pin.