I started making a tracker out of a leaf spring about 15 years ago, maybe more, but stopped because I didn't have the necessary tools or knowledge at the time. I had used a grinder to get the rough shape (which I am changing now anyway). The leaf spring sat in a closet until I found it recently and decided to finish it. I started by annealing it in a charcoal grill. Yesterday I went after it with some files. This is my progress so far.