(sorry for the additional empty message-my bad)
Thanks! I wrote to them now about it and hope they indeed send me the part.
By the way, is there a chance it started the problems due to "heavyweight lifting" (*) with the winch (and thus the clutch worked very hard these few days)?
If it's true, they should say something about that in the manual, like all other warnings and "don't do" list/figures that are found there. For me it's not obvious that working hard with the model should ruin the part.
(*) i.e. many times the vehcile pulled itself with the winch since heavy objects were attached to the hook at the front.