Harmonic dampers, AKA harmonic balancers, help absorb internal engine vibrations to ensure your rotating assembly stays happy. Problem is, sliding one onto a crankshaft isn’t the easiest job and there’s risk of damage if done incorrectly.
Not too long ago, the go-to damper installation tool was a big honkin’ deadblow hammer. (Spoiler alert, don’t use one of those.) Thankfully, there are now specialty harmonic balancer installation tools that make putting on a harmonic damper much easier.