Have any of you MM Stingray owners even noticed this?: A definite line on the back of the neck between the neck and headstock where the wood colour differs somewhat? The headstock wood is still pristine. But, as is to be expected after several years of use, the neck wood has darkened a bit. Why is there such a precise discrepancy in colour? I would have assumed that the neck and headstock were all fashioned from one piece of wood. Forgive me if this seems like a stupid question.