I went to change my rear sprocket on my 2013 DRZ tonight to a 48 tooth, and found out that Suzuki is now using the Amelock nut, instead of a top lock flange or nylock nut. The axle nut is also a Amelock nut as well (instead of a castle nut w/cotter pin), and makes removal UNNECESSARILY difficult! I was not able to remove the sprocket because I rounded off the hex key I was using, and the 12mm wrench was rounding off the amelock nuts. Anyone have a tip on how to remove the nuts easier? If you are unware of what a Amelock nut is...here is a link. http://www.amecoil.com/products/9-25/miscellaneous-fastenings/amelock-self-locking-nut.html I hate having unfinished projects in the garage, so hopefully someone can help me out. I'm very close to taking the tire and wheel to the dealer and asking them to try and get the nuts off.