My pajero is at my friends at the minute having some surgery,so i'll get some pictures when I can.
Basically the torsion bars have splines on them,the splines slip into splined holes on the wishbones,and are anchored to the chassis on the other end of the bar. For the right hand side front one (looking from the back) as the wheel travels up the bar twists anti clockwise, and as it goes down it twists clockwise.
The bars themselves don't actually twist much,but the more they are twisted makes the suspension harder,but when you slot them into the wishbone you can turn them by one spline,doing this will alter the amount of "pre-twist" the more of this pre-twist it has the firmer it will be.
When the bolt is turned in say half way,with the bars indexed to the factory spec the front will sit at the factory height. With the bars indexed one spline anti clockwise it will sit a bit lower with the bolt in half way,however you can then wind the bolt in a bit further,which will raise the front up a bit,and also give the bars a bit of "pre-twist" making them harder. This will make the from sit at the standard height,but will give a firmer ride.
I hope that I described it clearly (it made sense in my head) but if I haven't give me a message and i'll try make it clearer