I need to transfer my SRAM 10-speed cassette from my old wheel to my new wheel. Unfortunately, the stack of loose cogs & spacers got knocked over on my work table. There is a wafer thin metal spacer/washer in the mess that goes somewhere between the cogs. Does anyone know where this thin metal spacer/washer goes? I've tried SRAM's web site but there is no documentation that show a blown-up picture of a cassette.