four/five Posted January 31, 2022 Share Posted January 31, 2022 (edited) Not sure whether post here or in "tecnical". Whats the truss rod allen key size on bb425, i e tried a couple of 5mm but they appear a tad too big. An old imperial 5/16" works but its loose fit. Surely Yamaha would not have their own size ? As far as im aware its the original rod ie: two way adjustment. Thanks in advance. Edited January 31, 2022 by four/five Quote Link to comment Share on other sites More sharing options...
mcnach Posted January 31, 2022 Share Posted January 31, 2022 I don't think it'll be Imperial for Japanese instruments, so it's likely a 4mm key if the 5mm is too big. 1 Quote Link to comment Share on other sites More sharing options...
Machines Posted January 31, 2022 Share Posted January 31, 2022 2 minutes ago, mcnach said: I don't think it'll be Imperial for Japanese instruments, so it's likely a 4mm key if the 5mm is too big. There's been no Imperialism in Japan since 1945. And checked my BB415 just, 4mm is correct. 2 Quote Link to comment Share on other sites More sharing options...
four/five Posted January 31, 2022 Author Share Posted January 31, 2022 4 minutes ago, Machines said: There's been no Imperialism in Japan since 1945. And checked my BB415 just, 4mm is correct. Thanks for reply, now where's my 4mm gone? Quote Link to comment Share on other sites More sharing options...
Machines Posted January 31, 2022 Share Posted January 31, 2022 1 minute ago, four/five said: Thanks for reply, now where's my 4mm gone? I use this Ibanez multitool for nearly every bit of work I do on mine. The truss rod/allen keys have fit everything i've had in the last few years apart from US made stuff. https://www.amazon.co.uk/Ibanez-MTZ11-Multi-Tool-for-Guitar/dp/B00F4SDYNS/ref=sr_1_2?crid=1EJWW1J0KK810&keywords=ibanez%2Bguitar%2Btool&qid=1643648967&sprefix=ibanez%2Bguitar%2Btool%2Caps%2C65&sr=8-2&th=1 Quote Link to comment Share on other sites More sharing options...
Downunderwonder Posted February 1, 2022 Share Posted February 1, 2022 5/16 is knocking on 8mm so maybe you had a 3/16?? Quote Link to comment Share on other sites More sharing options...
four/five Posted February 1, 2022 Author Share Posted February 1, 2022 You’re right 3/16. Now things go from bad to worse. On putting new strings identical to the original D’Addario’s , the nut has broken on the B side. Perhaps a difference in diameter of nickel and steel, seems odd. New nut or glue. Quote Link to comment Share on other sites More sharing options...
Machines Posted February 1, 2022 Share Posted February 1, 2022 46 minutes ago, four/five said: You’re right 3/16. Now things go from bad to worse. On putting new strings identical to the original D’Addario’s , the nut has broken on the B side. Perhaps a difference in diameter of nickel and steel, seems odd. New nut or glue. I had this happen recently, the G side pinged off but managed to find it. Superglue and 30 mins it was fine 1 Quote Link to comment Share on other sites More sharing options...
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