The high-quality, hardened screwdriver bits that come with impact drivers usually fit the screw heads much better than even the best screwdrivers, which helps all by itself. Most impact drivers will let you set them for left and right turning, to loosen or tighten screws. The beauty of the design is that the force you impart to the impact wrench by hitting it with the hammer is forced into the screw, helping the screwdriver bit bite into the screw head (or what's left of it). So when you hit the top weight, giving it momentum, it compresses the spring and hits the ramp which turns the screwdriver-bit-holding bottom weight. The ramp makes the bottom weight with the bit in it turn. In between them is a spring and a circular ramp. An impact screwdriver is essentially two weights held apart by a spring. The best remedy for a stuck screw, or one whose head has been stripped, is the impact screwdriver. If you've worked on bikes at all you're probably nodding your head right about now, saying "yeah, I did something like that." Here's a guide to un-sticking stuck fasteners. If you've worked on bikes at all you're probably nodding your head right about now, saying "yeah, I did something like that." Bikes today have higher-quality fasteners than they did 10 or 20 years ago, but still the various forces of entropy conspire to stick fasteners together a little stronger than they're designed for. But you've got your trusty Vice-Grips in the tool box, so you clamp them onto the screwdriver's shank and really bear down on the screwdriver. It slips out again, rounding the screw head a little. The screwdriver slips out, so you try again, pushing harder. You apply your trusty $1.89 K-Mart screwdriver to the first screw, and turn. To get the oil filter cover off you need to remove three cross-head screws. Imagine this: You're doing the first tune-up on your newly acquired bike.
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