Tapered-End Screws

No matter how precisely you drill holes in your model airplanes, when you try to screw in bolts and other threaded fasteners that center up with the internal threads, it is best to use a bench grinder (or even a Moto-Tool with a grinding wheel) and taper the front end of the screw. This allows the fastener to fit and center itself so that the threads don’t bind. It works every time. George Mackey, Pittsfield,...