Show us your home made tools

This wasn't my idea, but I saw this carburetor bench pressure tester in one of Harold Demes's videos. It was cheap and easy to make, and was very handy in setting the float levels & testing the needles/seats. I think the picture is pretty self explanatory, but it uses fuel line, a boat primer bulb, and a fuel pressure gauge teed into the line. Incredibly simple and incredibly useful!