With these locking nuts, use of an air-gun on the locking tool causes the "pretty pattern" in the locking nut tool to crack. As soon as any pressure is put on tight nuts,it breaks off from the tool!

Getting more of these at roadside, whereby we're using a bar to undo them, and the tool is breaking because the nuts are too tight! Customer then thinks it's our fault, because we were the last ones to use it.....