Just to finish this topic, I found the answer.
According to European guidelines, each sidestand must be equipped with one or more devices (spring, clip) so that it will remain in the up- and down position. In the case of springs, trouble free operation must be obtained:
* At least 10.000 times with 2 springs
* At least 15.000 times with one spring
So Honda opted to go for the 2 spring option at some point for the EU market.
Note the small spring is bent around the nut to keep it from sliding over it all the time.
