Review on Powerbuilt 647796 Ratcheting Caliper Piston by Justin Spoja

Bought to make brakes on multi-piston calipers, works like a charm. The tool is fairly self-explanatory, so very little instruction is required. That's good because there were quite a few instructions. The tool came with a spring about 2 inches long, which is not mentioned in the instructions. I'll be damned if I can figure out what the spring is for or how it interacts with the tool, the tool works fine without it.