Yes I lost the locking nut socket to the wheels on my 240sx a few years back. After screwing around and basically scratching my wheels I found a solution. All you need is a chisel and a hammer. Usually they have a squiggle pattern in the center and it is pretty easy to notch the outside of the nut. Hammer a fair sized notch into the lug nut. Stick the chisel in the notch and use the hammer to turn the nut. After a revolution you should be able to take it off with your fingers. Worked wonders on my car (unfortunately I had a few scratches from the air chisel before I figured out a more effective method. Once I got rolling all four were off in about 10 minutes. You'll have to buy new nuts afterward... but if you don't find the socket you're stuck buying new ones anyhow. Good luck.
