Review on Brake Spring Compressor Tool - ARES 70191 - Enhancing Leverage for Easy Removal and Installation of Challenging Hold-Down Springs in Drum Brakes by Shaun Helm

It is better to remove the springs than to install them. The grooves do not have sufficient engagement with the lockwasher to rotate it during installation. Removal is easy as you can simply blindly rotate the tool until the parts align and the bracket releases. A small pair of pliers makes the installation more efficient. The cutout looks spectacular and lets you see the pen but you don't really see anything. I wouldn't buy this again.