So this is what I've been working for: the ability to make complex items out of metal while exercising the grey muscle at the same time.
I've got an '87 Ford pickup truck that has dual tanks. Ford, in their infinite wisdom, decided to design a device that lets the drive select which tank, front or rear, to use while driving.
This device uses pressure from an in-tank fuel pump to direct flow to the primary high-pressure fuel pump that provides the engine with fuel. Unfortunately, this device is mechanical in nature using a rubber diaphragm that is prone to failure. In my case, it's failed, but not catastrophically. The truck will drive fine then randomly seem to run out of gas. My only solution is to get under the truck and smack the tank selector with an object until it works again; not an ideal solution. I've already replaced the tank selector once, but as Ford no longer makes this part, my only option is to get a used one from a wrecker. The second one failed as well.
Now that I've got all the equipment, and some of the skills, I'm designing and building a mechanically-actuated tank selector.
My first task this weekend was to machine, out of brass, the specific connectors that Ford uses in their fuel system.
From design to a couple fittings (I need 6, 3 of one diameter, 3 of another). The first fitting took me 2 hours to make.
All six fittings. At the end, I was able to make one in about 25 minutes.