Found this (for me) new kind of weight adjustable CVT rollers on a french website.
Producers (distributers) claim this rollers to be adjustable by putting a certain number of short metal rods into its body until desired weight.
Do this six times, have a test-run, re-adjust if necessary and be a happy scooterist.
Saw it until now for PIAGGIO only and certain sizes, but they might come in different hight and widht to meet other scooter requirements too (pls see pic).
If anybody has some experience, please chime in.