It took 3 months to build up the determination again, but I spent this morning replacing the motor assembly and reassembling with only 3 spare screws left at the end (In the 3 months that passed, we got another one second hand, so now I we've got two working robotsl
Thia ruined me last night Had to remove nearly everything to reach the main motor, only to find that the tiniest $0.005 gear had stripped itself