VW 1302 Beetle IRS

Instability on steering reaction of VW1302 Super Beetle has been caused by just a trifle factor, lower tire pressure according to atmospheric lower temperature, 0,2kg/cm2. We have fore seasons with 30 degree temp. differences. It's a matter for being ashamed that I didn't realize the fact immediately in spite of long term experiences with poor sensitivity.
Spent I afternoon yesterday for rear brake shoe adjustment and clutch wire lubrication, both of them are very important to enjoy smooth and comfortable ride, with not two stepping pedal reaction but solid and tight pedal touching and well controllable clutch and pressure plate meeting and engaging without any unnatural wire slipping resistor.

Thanks to this misunderstandings, I could check out the construction of rear trailing arm inner bush mounting construction, a huge Hex headed bolt from diagonally forward direction outside is used as hinge centric fixing pin and axial pressure is exerted by a metal solid washer is utilized. So, it is relatively easy to control the rate of compliance in lateral direction by inserting adjuster sim made of metal or rubber material between bracket and rubber bush external surface imbedded in the lower suspension arm inner hinge. 1mm thickness sim on both inner and outer side would perform the resisting power preventing the movement of the arm in axial direction. The reduction of compliance on this portion would be effective on the stability in exchange for some increase of deterioration of ride, also here occurs as usual.

The improvement of steering reaction at rising stage should be felt so considerably as to fix steering centric position while straight running, this is the result of killing a dead zone of steering performance. I would re-realize that the rear axial compliance has much to do with the rising stage of steering action, so imagine I do. Additionally, the change of the reaction is on the exponential curve, so it would not be so difficult to find out the most suitable rate of compliance for applying the adjusting sim as an experimental trial. This kind of interesting play should be done as an usual manners among the research and development division of every manufacture.
I'm sure that too much compliance applied VW 1302 Super Beetle would graduate from dull and muddy steering action and born again into a different automobile just like a young fish released into some clear stream. 
The procedure and the result of this experiment on the rate of rear arm compliance change would be reported here very soon and the easiest way to recover and re-obtain an original or better steering reaction without replacing bush parts here, if the rubber material inside had not been destroyed physically.