I had this happen just recently , when looking for part for my sewing machine , cleaned my sewing room for five days pulled everything out except one very top shelf , no part to be found so gave up , I sat down at machine and looked up to towards the ceiling ,l must of been just at the right angel and Bingo just caught a glimpse of my tray part I was looking for .....at least I now have a clean sewing room and the part .