Hi...just wondering if anyone can share their opinion about the stability of Fender's 70's Jazz necks (whether the real thing or on a reissue Jazz bass). Obviously the 70's necks do not have graphite reinforcement like the current American Jazz necks, and the truss rod adjustment is at the headstock rather than the butt end where it meets the body. Since the current American Jazz necks have these newer features, does this mean that the 70's necks are somehow inferior? Just wondering if I should be concerned about the neck stability, or potential for neck twist, if I buy a 70's Jazz (assuming I don't expose the bass to exteme changes in temperature or humidity). Will a 70's Jazz neck require more frequent adjustments due to seasonal changes versus a Jazz neck with graphite reinforcement? Also, has anyone noticed any tonal differences between necks with and without graphite reinforcement? Thanks in advance for your opinions.