Thanks !
I have no problem yet with the 24t clutch gear. When I block the wheels, the XL motor stops. Maybe because the 24t clutch is new.
The worm gear is not completely maintained, it can slide, which allows to change with the hand.
It's possible that there has similarity with Madoka's Wing Body Truck. I really like his truck. This design is classic. Other people have told me it is similar to #8258.
But I realize that my panels of my cabin also has the same positioning.