Hi Hubert,
great that you’ve found us 
Unfortunately I’m also not familiar with the Strida 3.0 series…
Once you move, could you do that via Paris?
Seems that the French guys do have some older parts in stock:
http://www.strida.tv/26-pieces-detachees
Guess the desired parts will look like this:
(Picture from Korean Strida dealer site, link with Korean letters didn’t work at the forum.)
You might also read here and ask the poster nicely if he has cones and nuts, too 
Kind regards,
Chris