Soapy Threads

If you are trying to thread a screw into a plywood or hardwood block—for example, for a landing-gear strap—it is often hard to thread the screw into place without wearing out the screw head. The best way to make the screw go into the tight-fitting hole is to apply some bar soap to the threads. The soap lubricates the threads and makes the job much easier. It also helps when it is time to remove...