Nice saw handle Michael, in fact there are rasps made specifically for stair makers and saw handles. They are likely very handy if one is doing a lot...
One of my habits (not going to debate whether it is good or bad) is to keep extras of many things. This has mostly been made stronger by living miles...
Dad is a carpenter so grew up around tools and construction sites. Went to college for industrial mechanics and spent a few years as a field service tech in the corrugated container and pump field. Currently work inside sales and application engineering for industrial pumping equipment. I am an avid woodworker and outdoorsman, particularly working with hand tools and duck hunting.