X-heads vs J-heads: what's the difference??

X-heads vs J-heads: what's the difference??

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krazykuda said
The heads come to the assembly line on a pallet... The workers just unload them and install them as they come, no coordination from one side of the line to the other...

I always heard, "never buy a car built on a Monday or Friday". That would mean 40% of cars could be a little off.