propeller aluminum conical mount replacement parts?

Hi,

I am not sure what the actual title of these parts are, but i need replacements for the aluminum conical parts that hold the propeller onto the axle of the motor.  I have the previous version of Arducopter (4 arm).

 

I am not sure where to find this part--can someone tell me the name, and any sizing information so I can find this part either on diydrones store or a hardware/hobby store?

 

Thanks,

Angela

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