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@DoktorSpoor
Now I get you, they are called "friction motors" I believe.
If that's what you are after I guess most of us modelmaker types would just go and buy some cheap toys that do what you want and take them apart.
Generally plastic toys are only secured by a few screws or at the worst glued mouldings that can be prized apart. Pressed tin toys just tagged together.
Look for "friction toys" not as popular as they were since electronics became so cheap but a lot were Eastern Bloc/Chinese.
http://www.purplepuffin.co.uk/gifts/friction-motor-tin-police-car-with-siren-sound-p-14909.html
Have you tried 4D Modelmaking?
There are loads of handy plastic mechanisms inside secondhand Fisher Price baby toys too.
DS