Tiny but important adjustement

I found out the fact that the minimum ground clearance is affected by the backlash of the bolt holes in the trailing arm constructive connection in VW 1302 Super Beetle. Actual measurement on the portion revealed that 1 cm difference between right and left height. As a matter of fact, this kind of critical geometric deviation in axle construction might cause any discrepancies, there is no room to suspect. Torsion bar spring axle design makes it difficult to keep the parallelism between torsion bar arm & trailing arm connective potion when build up and fixed tightly. The supporting position of axle arm is very important to do that accurately, the end of the torsion bar arm should be done, not trailing arm itself. Relatively a big wood hummer with mass plays an active role in the precise adjustment situation keeping the parallelism and antero-posterior position. Just a steady efforts are my way as usual. 30 minutes muscle action while lunch time has improved drive feel considerably.
As various problems in Super Beetle has been solved and reduced gradually, the free play on the steering gear link construction with worm gear and drag link module make me feel worse leading to some instability of driving because the relieved centricity of steering is spoiled by the hysteresis phenomena caused by the backlash there. Backing rudder action is required and it's timing is delayed all the time, bad steering manner invites driving fatigue for me. The opinion mentioned here is very strict area of centric position, so ordinary driver would not perceive this phenomena. Anyway, the counter measure for this problem must be considered for the next attempt. I'm sure that much more steering stability while straight running would be obtained if the backlashes would be eliminated in a way, screwing in the clearance adjuster on the gear box and inserting some engineering plastic thin film on the moving surfaces gap in the drag-link construction?
Steady efforts would generate substantial driving joy without any arguments.