* Change 2 Part Black {6628 Technic, Pin with Friction Ridges Lengthwise and Tow Ball (Undetermined Hole Type) to 6628a Technic, Pin with Friction Ridges Lengthwise and Tow Ball with Round Pin Hole}
Comments from Submitter:
Source: Set from my personal collection which was bought new and not mixed with other parts (at least not with other 6628 parts).