Torsion bar removal question

Ok, I have seen several of those torsion bar removal tools in the mags. What I want to know is the purpose of them.

Is it just to keep from scratching the bars, or is it to keep from damaging them? I always thought that if they got nicked, that would fatigue the bars and increase the possibility of them breaking under load, which would probably suck.

So is the tool worth getting? I would like to keep the bars usable. I hate damaging parts just to take an easy way out. How hard is it to make the tool myself? All I really got is handtools and a drill press. I do have access to a welding machine though.

I have to remove the bars to take the engine/trans/front suspension out from under the car. I plan on getting all that into shape at a different location than the car currently sits, putting it all back in, then praying to god and getting the car home.

Thanks,