The headphone jack in my 464 is in a state of disrepair; I have to constantly wiggle my headphone jack in order to find the sweet spot, and even that won't stay. I'm sure on of the contact points must be loose, bent out of the way or something. Anyone else had this problem and been able to solve it? I'm leery of opening the machine, and even if I did, I believe the jack is encased in some chastity belt-like contraption where you can't get at it? Any ideas?