I hadn't thought of a "removable lever" style but if by some chance that is what you have then Hill's advice makes sense.

But all the "security" skewers I've seen are just threaded and are tightened by screwing the thread tight. Using an allen key to tighten these screw type skewers will require a HEAP less torque on the allen key than what we're used to using on a direct action flag lever. Your guide for this is the size of the thread in the skewer nut. That's a 5mm thread so you want to use no more than a 5mm screw level of torque on the allen key. And that means you can fully reach that point with just a thumb and one finger on the allen key without leaving an imprint in your finger. And for the sake of thread longevity and consistent torque you should be greasing the threads. But since the threads will soon become contaminated with grit due to the grease you will also need to clean the threads out with a shot of brake cleaner with reasonable frequency. When you notice that the thread grease is really black or when it feels at all gritty would be the official notice.