[boygenius]

Here is a picture of my chassis while I was setting it up for the 944 trailing arms. The bar sticking out of the chassis is the torsion bar. It is basicly a rod of spring steel with serations on either end. The large splines are on the inside and are held in place by the center of the torsion tube. The smaller splines are on the outside of the torsion bar and are held in place by the spring plates. Their resistance to twisting is what VW and porsche used for rear suspension springs.