This 1934 Martin 00-40H was discovered
while an old house was being emptied of it's contents in preparation
for refurbishing and resale. The guitar was in a closet along
with 2 other 30s instruments as well. I acquired this guitar
in May of this year with the aim of converting the guitar to Spanish
style play. The guitar is completely original and crack free. The
hawaiian style set up differs in several significant ways from
Spanish style set up. The neck angle for hawaiian set up is
much shallower (allowing for the strings to be high off the
fretboard), the fretboard is dead flat along it's width (as opposed
to slightly radiused) the frets are ground dead flat to the
fretboard (serving as markers only as the strings don't touch the
frets) and the saddle has no compensation (it is slotted straight
across, no slant. In addition, the nut is very high in order
to facilitate slide play. Conversion involves addressing each
of these issues to make the guitar suitable for Spanish style play.
The frets are now removed and it's time to
radius the fretboard. For this I simply used a radius block
with 100 grit sand paper attached to the surface with double stick
tape. Working carefully the fretboard was radiused within
about 30 mintues. Once the proper radius was established I
resurfaced the board through successive finer grits right down to
320 for a smooth finish that gives a good patina to the board.
Older Martins such as this one have thinner fretboards than modern
guitars so it is critical when radiusing the board to only remove
the amount of material necessary to achieve the desired radius.
Going beyond that could result in several potential problems
including sanding through the inlays and lessening the inherent
stiffness of the neck.
Next, the frets are leveled. Bar
fretwire is quite tall when in it's raw form before being ground
down. The fret slots, though not made overly shallow from the
fretboard radius operation, left the frets standing quite quite tall
after installation. I used a simple flat mill file with a
fairly aggressive tooth to grind the frets quickly. After
recrowning and polishing the neck is ready to reset and attach to
the body.
The re-routing of the saddle slot is done with
the assistance of a jig that works with the Dremel Moto tool.
The jig guides the moto tool once set to cut the proper compensation
slant. Using a carbide tipped spiral 'down cut' bit and the
jig the new saddle slot it routed to the proper compensation for
spanish play.
The new saddle
slot and bone saddle.
The nut, originally 1/2" high to facilitate
hawaiian slide style play, now had to be taken down for the new set
up. The same original ivory nut was shaved down to the proper
height and reinstalled.