Kewl Go Kart barn find what's it worth

It probably will require heat. But it will have to wait until I get it over here.
It is right hand thread, there is enough outside of the nut where I can tell this.
The Rupp would be no fun to ride around here. It sits so low to the ground it would be bottoming out all the time.

What also may help: After you heat it (even with just propane), touch a candle to it and let the wax soak in. As the wax solidifies, it kinda pushes things loose (relatively).