Yes, I took the 3 screws off, removed the assembly that was held by the 3 screws. Placed it on the table then pressed the rotor weight back on.
That's how it worked for me, maybe others have a more professional solution.
I got mine from another TD, but it arrived with the same problem: The rotor weight got loose, but I could fix it myself.
I unscrewed the 3 tiny screws (be careful not to lose them) pressed the rotor weight back on, then reattached the rotor assembly.
Good luck!
Roger