I found this on ebay and it is amazing to help you figure out what your feet are for. I have a box of Greist feet and no idea what they were used for I am still unsure about a couple of the but I do know that most of the feet need an attachment foot to use the others which I have! It gives you a general overview of the feet have fun!!!
http://reviews.ebay.com/HOW-TO-USE-Y...00000004651980