Possibly Stupid A Arm question

[88911coupe]

OK...I have read many, many threads and looked at countless pics and there is something I don't understand about the front A Arms on our 911s. Which end of the torsion bar is "locked" and which end rotates with the suspension movement? I am thinking the end at the back, close to the subframe is locked and the end closer to the front bumper rotates but how is the up/down movement in the A Arm connected to the torsion bar? Sorry if this is a stupid question...I just can't figure it out by looking at it or any of the threads I've read.
TIA

[llangston1]

The TBs go inside the rotating "pipe" of the A Arm. The Splines are stuck into the A ARM at the front end and locked at the rear end with the adjuster cap. So the TB twists at the front end as it rotates with the A arm and the rear stays locked to the suspension cross bar.

[Walt Fricke]

The adjuster at the rear is where the torsional force is transmitted to the chassis via the crossmember. Which is why it is adjustable there.

[E Sully]

Thought I'd toss in a diagram, since I always find it easier to understand with visuals.
The front splines of the torsion bar lock into the front of the A Arm, in green, which rotates up and down.
The rear splines of the torsion bar lock into the splines in adjuster cap, part 19, which has the adjustment screw 20, in red. They are held stationary in the crossmember, part 1.

[88911coupe]

Wow, now I get it. It really is pretty simple with a diagram and a couple of good descriptions. Thanks,