Safe speed to avoid motor cracks?

[joeyjan19]

Yep - every one I've been to, they're fitted by a machine, which is held by a human, but I'm sure that most of these are now fully automated. But regardless of the method of the delivery, they are nuts or bolts, which are compressing steel-to-steel; they are not steel bolts and screws being delivered into styrene plastic, so there's completely different levels of torque required. Given the cost of labour in China, I'm sure it will be a human inserting these and, with the vast variations in the level of tightness I found on my 3A, I very much doubt if they're tightened using a torque measurement device either.

I failed to check the torque when I first removed the bolts on mine and I have been wondering how they varied.