From what Phil Kubicki explained to me, your basic string set has the most tension on the D and G strings and less on the E and A (and B if applicable). You can double check your average 105-85-65-45 set on D'Addario to see the tension. When the headstock is removed, all of the tension is transfered to the nut, which can make them more prone to twisting in the long run. Personally, I have seen a few twisted necks in person. A local store I frequent used to sell Hohner, Cort, Spirits, etc. in the 80's when it was popular. Eventually, some made their way back and couldn't be repaired and were kept for parts, since they weren't good for anything else. These particular ones consisted of a cheap Spirit and a cheap Hohner. Trust me, it wasn't pretty!!! Correct me if I'm wrong, but Warwick used to have something on their site about the Noddy bass and specifically mentioned that they were prone to warping.