I am not as familiar with you, obviously, but I am not naive.
If you are selling watches coming off the factory defective, should we, the customers get you to fix it or should we petition the factory? The answer is obvious. We give you the money and you give us the watch. We have no contact with the watchsmith or the factory, so we can only ever contact you. If you want to act as the sole dealer in the transaction, you are 100% responsable. If it works, you'll be getting 100% of the profits and if it doesn't, you'll be getting 100% of the hassle.
Don't pass the buck, you stand to do very well out of this if you sort it out. We're here to help you in this and future projects if you show us you can make it work.