Learn how to machine a double keyway and complete a custom arbor for a Syracuse spindle sander in this detailed video tutorial. Follow along as the process of creating a custom broach bushing for two keyways 180 degrees apart is demonstrated. Observe the techniques for screwing down key stock on the shaft and assembling the final project. Gain insights into vise setup, finding and checking center, broaching keyways, removing and installing keyways, and installing bearings and bushings. Conclude with the final assembly, acquiring valuable machining skills applicable to various projects.