Lucky day! You've found a vintage Hamilton Beach 712-1 or 712-2 disk adapter screw nut ("disk knob"). This Hamilton Beach food processor disk plastic screw has some stains from normal use, and is chip- and crack-free. This is just ONE piece of three pieces that are required in order to connect your Hamilton Beach 712-1 712-2 food processor blades to your food processor, so this replacement part on its own will do you no good--you need to use in conjunction with other parts, which are available in other listings.
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