Allen Wrench Renewal

Well-used Allen wrenches can quickly wear out as the corners of the hex body round over. Though most are fairly inexpensive to replace, here is a quick fix if you don’t want to make a trip downtown. Using a cutoff disc and a high-speed motor tool, simply grind off the worn-out tip. Take your time and make a clean vertical cut using several light passes. Use a little emery paper to remove any hanging chips,...