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I am installing Gotoh open back tuners part number GNS1B from LMI on my first guitar. I have not been able to find any instructions on installing these. I am confused about what size hole to drill for the shaft and how to counter bore for the bushing.

The shaft is 1/4 inch (6.35 mm) but by the housing where the shaft sets, the diameter is .295 inches (7.5 mm). Should I drill the through hole 0.295 inches or will 1/4 through hole be best to use.
What is the best way to put in the counter sink for the bushing?

Thanks

EddieLee

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EddieLee

Eddie,

That little lip is only 2mm tall, so I just use a countersink. Keep the rest of the hole at 1/4". You want a good fit for the shaft.

Pat

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formerly known around here as burbank
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http://www.patfosterguitars.com

Drill a 1/4 inch hole all the way thru .. then drill for the countersink on the back end/plate of the tuner. You will need a Stwe mac drill/reamer for the bushing - I think the std size for waverlies works fine .. but measure the bushings to be sure

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Tony Karol
www.karol-guitars.com
"let my passion .. fulfill yours"

just experiment with different bits on a piece of scrap made of the same wood and find what works best

+1

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Ken Franklin
clumsy yet persistent
https://www.kenfranklinukulele.com