Thereafter saw Mike about once a month. Was safe, never went there except when they called me for malfunction beyond ability of their staff—and I was always able to "repair" it, sometimes quickly, sometimes after a full day and many tests. Was careful to leave tool marks on cover plates, and had before-and-after print-outs of test runs to show what had been wrong, how I analyzed it, what I had done. Mike always worked perfectly after one of my visits; I was indispensable.