KoP ToughBox Mini and CIMs Problem/Solution

[SenorZ]

I've tried searching to see if anyone else is having the same issue (and "solution") as us.
Problem:
we assembled our TB's as per directions, but when powered they made a screeching sound.
Attempts to fix:
we disassembled and put in extra lubrication, reassembled step-by-step from in-box instructions (and from online instructions).
Result:
Gears still got stuck. We didn't power it the second time, just assembled the box and attached motor, then tried a manual turn. Gears were difficult to rotate for about 1/2 turn, then jammed up. We noticed the top land of the pinion were making contact with the bottom land of the next gear... a very tight fit.
Solution?:
After an email to AndyMark and a quick reply promising a replacement of both TB's, a parent noticed that the mounting screw holes on the CIM didn't look perfectly inline with the motor shaft's center. We tried flipping the CIM 180 degrees, bolting it in, assembling the gearbox, and it all spun as it should!!! So the problem is technically solved. Since both of out TB's had this issue we flipped the CIM in the other and it seems to work fine, too.

Has ANYONE EVER had a problem like this? It seems the CIMs were the issue, not the TB's. I'm tempted to pull last year's CIMs off the old robot and test them, but really don't want to disrupt the progress we're making.