[ChrisBennet]

I reuse the 10mm CV bolts all the time. I put Schnorr washers on them.
I don't reuse the 8mm ones. I've seen a several loose 8mm CV bolts and I think it happened to me once or twice. My solution is to use new ones. I don't know if it is the grease in the threads (of the old bolts) or what but it solved the problem for me. These bolts are relatively inexpensive so it's cheap insurance.