Many cyclists use Garmin bike computers, because they integrate gps, heart rate monitor, cadence, and power information and record it all so we can look at it later. If your bike falls over with the garmin on the handlebars, the two tiny plastic mounting tabs on the back break off. Then you end up rubber-banding it onto the mount, or buying a $70 new back plate for it, or giving it to a handy friend to fix. This is how I acquired mine, and now another friend has had the same thing happen. Insofar as I have a system to fix them, I ran his through. (Note that since I first started doing these, people have come up with other commercially available repairs.)
So, picture of what the tabs are supposed to look like, picture of his broken one, the cnc mill cutting a dovetailed slot in wood as a test run, cutting a dovetailed slot in the back of his computer, brass strip the same thickness as the tabs with a new tab-shaped recess cut in it, then a couple of the final fitting. I had to hand-file 60 degree dovetail angles on the edges and countersink the 1-72 screwheads, both of which were a pain, but not half as much of a pain as trying to get 1-72 nuts onto the screws, with a bit of epoxy making everything sticky. That required two sets of tweezers under a microscope.