[Walt Fricke]

There have been lots of discussions about this and related issues. Some favor doing exactly what Porsche did and nothing else. When it comes to these special washers, Porsche did not always use them for various applications, which suggests maybe it doesn't matter, really.

Jeff nailed what is the real key to keeping fasteners tight and in place - enough bolt stretch, which is approximated by torque. That's what race engineer Carroll Smith says in his book on fasteners. He says that even safety wiring won't do the trick if the stretch (and in the case of a bolted joint, the resulting clamping load on rotating reversing mating surfaces)is inadequate.

I use no washers and none of those plates with two holes on my 8mm bolt size CVs, and I have never had one which was properly torqued back out.

So it is a question of your comfort level, I guess - you can't go wrong if you have adequate torque.

Of course, not a big expense for those washers, and if sending off for new Schnorr's doesn't affect your schedule and you like the idea of following the actual factory manual for your model, why not. It makes sense that you try to keep the metal to metal joints on both sides of the CV pretty grease free.

And checking the torque of all of them after 100 or so miles of driving isn't a bad idea - if you missed something you can catch it. When torqueing mine I like to go one extra bolt around just to make sure I got all of them.