Quote Originally Posted by wizard69 View Post
It is also baloney. Split lock washers, at least good quality ones will highly resist the unscrewing of a bolt or nut. I've seen this first hand may times trying to take apart devices assembled with such lock washers. They will very much dig into the underside of the bolt head and very much resist your efforts to disassemble the joint.

Now maybe he has a different definition of what it means to lock the joint. If so it would be wise if the manual was updated with full qualification.
Yup, he can also be variously defining the phrases "normally flat" and "fully torqued", and he's careful to qualify his statement with "At this time". Also, if the fastener comes slightly loose, the lock washer is no longer equivalent to a solid flat washer; it can then maintain friction.