Info from Doug's "Leatherman Waves, then Charges" article on the ETS home page:

"Leatherman continues to use TORX-PLUSŪ tamper-resistant fasteners to secure the blades and tools on the Wave and Charge. They remain opposed to allowing owners to easily adjust the pivot tension and we have received occasional reports of misadjusted tools which require return to the factory to be fixed or replaced under warranty. We remain opposed to this philosophy, preferring that they'd make it easy for users to adjust this on their own, but that's the way it is. You can, with some effort, expense and a little white lie gain access to the bit required to fit these screws. Of course, doing so voids the warranty. Word to the wise and all that."