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  #1  
Old 01-21-2022, 08:54 AM
Palo-Kai Palo-Kai is offline
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Question Tuning Machine Holes Too Big

Am putting new tuning machines on an old, 70's Japanese 12 String. I notice that the holes in the headstock are bigger than the tuning machine spool. Strings pull the spool/cylinder against the ferrule/bushing and it becomes very difficult to turn the knobs.

Is there a fix for this? Please explain it to me.
Thanks
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Old 01-21-2022, 09:58 AM
BradHall BradHall is offline
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By spool do you mean the post the string wraps around? Are you putting unmatched tuners into existing ferrules ? If you have a complete set of new tuners, one path would be to remove all existing parts and fill the hole with a glued in dowel. You can size a larger diameter dowel to fit with sandpaper. Chuck the dowel in a drill press or a hand drill.
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Old 01-21-2022, 10:06 AM
redir redir is offline
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There is a fix for everything

Google up, 'spiral bushings' and you will see how violin and cello makers do it.

The holes can also be filled and re-drilled.
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Old 01-21-2022, 10:50 AM
Palo-Kai Palo-Kai is offline
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BradHall, thanks very much. This will work great.
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Old 01-21-2022, 10:52 AM
Palo-Kai Palo-Kai is offline
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redir thanks so much. Looked up spiral bushings and understand. Between this and filling the holes I will get my new tuning machines in this weekend.
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Old 01-21-2022, 11:06 AM
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hubcapsc hubcapsc is offline
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You can buy stainless steel tubing with almost any imaginable
inner and outer diameter. I once sleeved some tuner bushings.
If it is the size of the hole that's wrong for you, you could sleeve
that.



My idea is non-traditional, if you'd be good at plugging the hole
with a dowel and redrilling, that would count more as a "real"
or traditional fix...

-Mike
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Old 01-22-2022, 08:04 AM
Don Grimm Don Grimm is offline
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Default Tuning machine holes

StewMac sells bushings to adapt larger holes for smaller tuning posts and machines. Measure carefully.

https://www.stewmac.com/search/?q=tuner+bushings
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Old 01-22-2022, 09:17 PM
mirwa mirwa is offline
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Quote:
Originally Posted by Palo-Kai View Post
Am putting new tuning machines on an old, 70's Japanese 12 String. I notice that the holes in the headstock are bigger than the tuning machine spool. Strings pull the spool/cylinder against the ferrule/bushing and it becomes very difficult to turn the knobs.
To retain the originality look to some machine head swaps, I will lathe up a new set of ferrules that fit the holes and the new machine heads, this eliminates the need for refinish work

The most common method is to sleeve the wood with a new piece of wood and drill the new hole, ideally the machine head and top cap will cover the insert

Steve
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