That's totally a good point. I messed up my ball joint's thread when I did my cv axle 4 the first time and that was the real pain.

But the force that I have to overcome is only 250 N m. I just thought if I lock the fly wheel/crankshaft with transmission and clutch and block all the wheels with wedges and brakes, it should be stronger than wrestling against another person holding the crankshaft pulley holder (I'm not sure weather it's the same thing as chain wrench), which is a movable part anyway (that's what I thought how the tool works, I'm not sure), then use a long cheater bar. If I can get it as long as one meter then I only need alittle more than 250 N of force to overcome. That's just slightly over 1/3 of my weight. But all that, is under one condition (hopefully not 2 or 3, like the bolt has welded to the nut)....that the car won't move, which I thoght it shouldn't becasue it's against the gravity. Yet, I still doubt that if this works why doesn't every body use the method. More over, I'm not clear about what the bolt is really holing or attaching to.That's why I posted the thread to see what other problems could occure.

Thanks 4 the advise, Since the worst that could happen is moving the car(low risk), I think I'll try my method once with the chain wrench next to me, standing by 4 back up if my method sucks.