Originally Posted by
Smallwheels
Peterwhitecycles.com has special key nuts for replacing quick release levers. They are called Pitlock Skewers. They still work as quick releases but you must use a special coded lever to make a quality connection. They work on the same principal as automotive lug nuts that need special keys to be removed. The site says that even vise grips can't remove the bolts without the special keys.
There are 2 other options out there that i've seen so far - i've not tried the pitlocks, but i've tried the Delta and Pinhead systems.
Delta? Forget about it. These are utter junk. The key and locking skewer head are so soft that they chew each other up as you use them. They're designed much too short and won't fit anything but a thin steel dropout. The front skewer started squeaking after a few weeks which was when I just got paranoid about them and picked up the Pinheads.
The Pinhead system is much different: The whole system is just wholly superior. Unique keys, smaller skewer ends which can't be grabbed with pliers, skewers which are long enough to accommodate just about any wheel, it doesn't squeak, and the keys and skewer ends don't get damaged just by you know, using them. You can get the pinhead system for the seatpost as well as for the headset. I would recommend these in a heartbeat, good product.
Side note: after having a pair of useless Delta skewers around, I threw them onto an old bike to see how they could be defeated, out of curiosity. They lost to a pair of locking pliers without effort. I give these a 0/10. Utter garbage.