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Johnparchem I disagree with your diagnosis. I don't see how fallaway at the body join will impact the lower neck unless the instrument is set up incorrectly.

To OP, IMO, your neck angle is too far backset. I would accept a 1/32 plane above bridge top with frets, but not without.

Yeah, you don’t want to make my problem yours! Much better to have too much fallaway than a ski-ramp. Mine’s a 12 fretter too, someday we should introduce them to each other.

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Bryan Bear PMoMC

Take care of your feet, and your feet will take care of you.

We have some conflicting information here:




If the second situation is what you've got (together with your remarks about the bridge thickness etc.), I agree with Ed: you seem to have the neck quite a bit more backset than normal. Putting that into the normal range will alleviate your problem with the gap under the fretboard (is the fretboard dead flat BTW?) but it will still leave you with a gap, on the basis of the numbers given. You can then figure out the best way to deal with that when you're certain how big it's going to be.

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Trevor Gore, Luthier. Australian hand made acoustic guitars, classical guitars; custom guitar design and build; guitar design instruction.

http://www.goreguitars.com.au

Maybe I misdiagnosed what would happen with 3 mm of fall away. I have had it happen to me fretting way up the neck at the 19 th fret on a guitar with too much fall away. My thought was that I pulled the string down farther than normal to fret and got pretty close to the fret at the body join and got back buzz. I pulled the frets and leveled the fret board eliminating the hump or bend at the body join and the guitar was good without the buzz,

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http://www.Harvestmoonguitars.com

A number 4 plane will be fine. In fact sandpaper on a flat surface will work too. Even a hand saw can saw a wedge that is 3mm tapering to zero. But you will need a little "fall away", so maybe 2.5 at the end. Don't worry, you can do it with the tools you have. If you need some help just ask.




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Ken