My matrix chip just arrived (GoCyberShop--great service) although the star-shaped washer that I have heard is supposed to come with it did not appear to be anywhere in the package. Does anyone know if there is something else that works well as a replacement and if so I would appreciate any input...thanks

the washer should be taped down inside the battery pack on the programmer. if not, any washer about the size of the screw hole will work. just make sure it's not too big as to ground out nearby traces and/or vias.