Hello. Just got a Japanese Squire around mid 80's (E serial). Standard 3 way switch, tone / vol. Bridge and neck pick ups. Getting a bit of hum and see all the wirings all wrong. Has the export type plastic switch which is not in great shape either. Can I replace the switch with an open USA style switch and wire it the same as a USA Tele? By the way has a Wilkinson replacement bridge and I see they haven't bothered to ground it. Can u solder straight to these bridges? Are they Stainless or nickel plate?