Quite agree with you PJB This is what i was thinking.I have just recently rebuilt my front suspension ,new kingpins and bushes and achieved a good fit.It is only possible when removing the main spring when doing this job to compress the spring with compressors by about 2 inches max to remove the spring so there is no way the spring will compress this much under road use.As you say my suspension will only compress by about 6mm if i stand on the front bumper.also as you say the car must be moving for the geometry to allow the sliding pillars to move freely.
Regards barry 78 4/4 4 seater.