Has anyone found a good internal-tooth washer and nut to fasten the prop to the motor?

I tried some M5-0.80 hardware from Lowe's based on 3DR's website, but it doesn't seem to fit properly.

http://store.3drobotics.com/products/motor-ac2830-358-850kv-1

When the Iris lands in tall grass or something touches the prop, the nut and washer often fly off so I think it would be useful to find local hardware for replacements.

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Use Loctite. or a locking castle nut

I bought the #10-32 nut and #10 washer from Home Depot. It works perfectly, but I also needed to purchase the 3/8 Husky wrench. See picture. 

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