OK... had time to take her out this morning. All seems to be working as intended. We'll see. Since the damn thing is working (albeit a little more permanent than original)... I've decided not to take this dispute to the next level. FWIW, I am 100% certain if I disputed the charge with my credit card, I'd win based on the evidence. That said, I was never looking for someting for nothing. I was looking to be whole again... nothing more.
Since it looks like I managed to get close to whole I'm OK. That said, I still can not with good conscience ... recommend Grubee because of this displute. I also hope that they change their included instruction to indicate ALL necessary steps required to lock down their sprocket... but I'm not holding my breath based on the communications I've had.
That about covers it.