If there is only one reason (there are far more, I am sure) to have used bed sheets it would be to practice making a square -- or anything else for that matter -- that you have not done before. Think of how many times you have used your "umpteen dollar per yard" cloth to practice on! I would be making a beeline drive to the local thrift shop and buy up those bed sheets. What you do not use in a test you can use to clean your machines(s) or anything else as they are pretty much lint-free by then. Those thrift shop sheets are a favorite of mine for doing loads of cleaning and restoration jobs on old machines. :thumbup: