My offering is a tool I've used more for non-automotive purposes, but still can have plenty of auto-related uses: an air compressor. I lived for many years thinking an air compressor and air tools were really specialized equipment. Then it came time to do a remodeling project and I purchased an air compressor in order to use a finish nailer. Suddenly my eyes opened to all of the possibilities: airing up tires (bicycle, motorcycle, auto), airing up large inflatables such as boating toys, air wrenches, including those for removing lug nuts, etc. I even use it periodically to air-sweep out the garage as it's especially great at getting in tight spaces, under the tool chest on wheels, and in the expansion joints of concrete. There are a lot of other potential uses, especially if people are doing body work.
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