DO NOT use your old locking washers when you put your CV's back together. NO SERIOUSLY... DON'T DO IT!!
We've heard of failure after failure after failure. Use new bolts, new washers and torque everything down properly (then re-check the torque after a drive). Correct M8 Schnorr washers are a MUST and, at just over three bucks for a complete set of 16, they're the cheapest insurance you'll ever purchase for your teener.