I bought a Strat recently that was made in Japan in 1975. The interior diameter of the hole where you screw in a tremolo arm measures 10mm. My research tells me that anything made in Japan these days is generally 5mm. Has anyone out there ever encountered a hole this size before? Any idea where I'd find a tremolo arm that would fit this trem block? The guy I bought the guitar from got it in Tokyo not long ago. The pickups are Greco, but I don't know if the rest of the guitar is, too. All the parts are original except for the wiring. I'll post a couple of pics of the guitar.