Hello Maciej,
or should I say Lachman?
Well, that’s no problem, all the info is still here:
crackling noise repair kit instructions
Note that the last post is leading also to an official kit source of Strida Canada West!
stridacanada.ca/?product=strida- … pgrade-kit
Please feel free to rebuild the kit and/or let me know if you want a complete sample from Vienna 
Pm below…and kind regards 
Chris