The reason to ask this is, considering my guitar has 27 years old and of course, some parts have wear on that time (specially the mechanical ones) like the rotary switch for example. That one has me intrigued because i've read that the one that has a pcb is different working than the "waffer" one. Also, considering i live far from any original spare parts source, should I invest in it? The switch is my main concern for now (i was looking the one from Stew Mac that seems to be cheaper) but also was thinking in importing a new nut and maybe some condensers for the tone/bleed. All of this was in my head,while also considering i have some tunning stability issues. I read you guys!