There are a pair of maps on the wall in the front office at Erlbacher Gear & Machine Works in Cape Girardeau. One is a map of the United States. The other a map of the world. Both are adorned with hundreds of blue pushpins. Grayson Erlbacher smiles as she looks at the map, realizing each pin -- placed in virtually every region of the maps -- represents someplace where her father's "crazy idea" led to the sale of a unique device made in the Erlbacher machine shop...