Harmonic Balancer 130ft/lbs on Stand

That's a nice looking tool! If you're bound and intent on torquing it to spec... It looks like if you made that, you would have the ability to either modify it for a 3/4 inch square drive for a power bar or flex handle. Or, you could drill and tap it for a pair of 1/2-16 bolts and make a handle to bolt to it from a 4 foot piece of steel pipe or flat bar with a plate welded onto the end to stand on against the floor while torquing. I have an especially ugly piece of rusty 4 X 3 inch rusty angle iron drilled and notched for the balancer bolt pattern with a long handle welded to it that I use for a crank holding tool on occasion that serves the purpose well.