Show us your home made tools
Here's a tool that I've used a number of times to install harmonic balancers.
Using this large nut, a 4 inch bolt, and a couple of washers with grease on them it turns fairly easy. Once the bolt bottoms out i can use the stock bolt to press it on the rest of the way.
I always put anti-seize on the crank hub and that helps a bunch.
You probably won't find the large piece at a hardware store. It's used for power line construction.