bigfefi

Thanks everybody. I'll explore more in detail!

Thank you for the info. Do you mean something like this ?

Hallo everybody! My name is Stefano and I'm writing from Italy. I'm sure I'll learn a lot of things here, and also I'll take a lot of fun. I'd like to build a Lego City with my 6 years son. We start not so long but the enthusiasm is big! (Sorry for english... ) Regards Stefano

Very nice!!! But I'm sorry I don't understand which motor do you use for this trick... Can you tell in detail?