I use HPI 103362 locking wheel hexes. Just tighten the grub screw onto the flat spot of the axle like the original wheel adapter, no modification required.
http://www.hpiracing.com/en/part/103362
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Team Xtreme Predator X11, Associated b64d, Associated b6.2d, Arc A10, Awesomatix A12, Xray NT1.3
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