I have a whole little bin of allen wrenches, and I've never failed to find one that fits. On the other hand, I just found my plumb bob (missing 7 or 8 years). And I know exactly where my missing sockets are - at our last house, there was about an inch-and-a-half gap between the driveway concrete and the garage floor. And yes, both driveway and garage floor sloped right toward it ...