Everytime I see a homemade tap wrench or a build thread, I think of a funny story.
I former friend (lesson- never lend money or tools), took an adult ed class in machining, The year long project was a tap wrench, the design covered all of the basic machine procedures and equipment use. As it was an adult ed class, 15 nights over a period of time, the design while solid was not super complicated. They were given plans and the required materials and basic instructions, with hands on help if needed. The former friend, was a perfectionist, with a severe OCD issue, along with probably AHAD and a few other syndromes.
The former friend has a home shop and was at that time unemployed, so he had probably 200-300 hours into this project. It was a piece that would make the people at Starrett, ohh and ahh, it was perfection, it had stainless steel parts, hardened tool steel jaws and was absolutely butter smooth in operation.
According to the class criteria, you had to get a “C” (70%) on the project to get the adult ed completion certificate, he handed his in, where everyone else got a report, 3 sheets paper with the 10 check points of the project marked, you score added up to get your mark, his was a single sheet with a mark of 50% (failing), stating while his piece showed extreme craftsmanship and build quality, it used material outside of the scope of the class and did not match the drawing in anyway, except, it was a tap wrench. He went spastic and threatened to kill the instructors, the people in the class and possibly any one he met in the parking lot on his way home. It ended up with him being arrested and thrown in jail for 3 days, as no one would post his bail, he ended up getting a $500 fine and 2 yrs probation, over a tap wrench.