I also got one with just the larger cutting grate. I found hat it does real well to cut the onions or whatever once. Put them in another bowl. then cut again . This gets the pieces real small. I once cut 20 pounds of onions for a church function and it didn't take much time at all. My sister had one with both grates an I tried to use the smaller one and found it hard to push down.
I would just order a new chopper. They are $20 from Bed Bath and Beyond and if you have a coupon they are less. Even if you could get the part it would probably be more than the chopper.
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