My kids got one of their toy RC boats (it is made by newqida, see pics) stuck in some weeds and melted down the cup that attaches to the motor that connects to a dogbone drive shaft. It is a low priced toy boat with plastic parts and not one of the higher priced ones that the parts can be replaced (that I can tell), but I was able to quickly design one and fix the boat. I did have to drill out the hole for the shaft a bit since I can never get holes to end up being the exact size I design them to. My son was pretty happy to see his boat repaired. I was happy that I didn't have to buy another one! Probably not a lot of people will have this same boat or need the part but I guess you never know. I also posted the viacad design file.