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"How To" Neck Reset Vers 3
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Measuring action at the 12th fret, we have around 5mm of action height
We pull the 13th fret to get access to steam the joint apart
Internally we have a standard heel block.
So we remove the fretboard and discover no tenon, so this is a Spanish heel setup.

The heel block does not exist, what we see internally is actually the end of the neck.
Now that we have identified why the neck wont come off, I put the fretboard back on, I do not put glue over the fretboard extension area.
Clamp and glue overnight
Fretboard glued back on, extension area not glued as shown by the A3 paper sitting underneath
To neck reset a Spanish heel you do what is called slip the back, so I mark out the distance I want to release the back from the sides
This classical guitar is around 90 years old, string tension has slowly raised the neck angle to a point where it is unplayable
Using a straight edge on the fingerboard, the neck shoots into the base of the bridge as shown.
Strings off, nut off, saddle out
With a steamer and spatulas we prepare the guitar
Spanish Heel
Spanish Heel
Spanish Heel
Necks stretch over many many years of use, the wood itself stretches and also the glue joint that holds the neck on can also creep.

This guitar was made almost 90 years ago, the neck angle is far from ideal, we need to set the new angle.

Sometimes the neck wont be able to be removed, in this case we have what is called a Spanish Heel setup.

Time to repair approx 6 hrs over 3 Days(glue dry times)
FAILURE

We attempt to remove the neck vee our set neck removal procedure and it does not want to come out