I believe the drive cup will come withthe set screw... You are talking about the allen head screw, right? It attaches the drive cup to the rear diff shaft.

You should not have to disassemble the car to attach the new shaft and cup. I install the cups loose, then work the shaft in before tightening the set screws. A little tedious, but you will get it. Before long, you will have taken the whole car apart, so don't worry about this little job! Haha.
Excelhobby is great. They sent me an email to tell me my order was received. They did not, however, respond to my email reply about the clutch I received being the wrong one for my car, or that the wheel hubs needed machining before installing. they need better customer service in that area.



Mark