Here is a nice simple tool that allows a racer to adjust timing on a MSD magneto with ease and precision. It is a simple clamp that clamps around the pro mag generator with two pin holes that allow you to simply loosen your mag clamp drop in your two pin wrench and simply advance or retard your generator.
Both parts are made from billet alum. and anodized for durability. Fits all MSD 12, 20, and 44 generators.