This guitar created a bit of a buzz among those who watch ebay for vintage guitars when it was sold on the auction site in the spring of 2003.  A 1939 Martin D-18 is, of itself, enough to cause some chatter when one shows up for sale.  This one caused more of it's share of groans and gasps due to what could be seen in the pictures.  Poor repairs and ill-advised "modifications' made this guitar seem a little less attractive than it might otherwise be, especially in an internet or long distance deal where the guitar cannot be viewed in person by the purchaser.  I watched the guitar with some interest until the price went beyond what I was willing to risk.  Several days after the close of the auction, one of my customers called to tell me he was bringing by the 1939 D-18 he'd just bought.  The same guitar.

What was clear in the auction pictures was that the guitar had some serious structural problems around the vicinity of the neck/body joint.  It could be seen that the top had cracked on both sides of the fretboard all the way from the joint to the soundhole, and that the top had sunken in that area as well.   The owner had attempted to stabilize the area by installing several pieces of plywood in the guitar under the fretboard extension.  The stress of string tension had badly distorted the rosette lines and had broken away bits of the spruce between the rosette lines.  It was also evident that there were 2 non-original pickguards on the guitar, one oversized guard in the proper location and one smaller guard (upside down) on the bass side of the soundhole.  What could not be seen in the auction photos (but was discovered on delivery) was that the fretboard had been replaced (poorly, and the replacement was purpleheart) and the bridge saddle slot was badly boogered up.  It was all repairable though, as you'll see.

The guitar as it arrived, fresh from ebay.

Here, the plywood that was added to the inside in an attempt to stop the top from sinking further can be seen.

 

The full damage to the soundhole area can be seen with the pickguards removed. You can also see what was covered up by the pickguards, lots of top damage in the form of grain tear out and finish loss.  It is my guess that the guitar had several pickguards removed during it's lifetime, and the top shows the ill effects. 

With the neck removed, the section of top beneath the fretboard simply lifted out, it having been cracked all the way from the block down to the soundhole.  As with the top beneath the pickguards, the top underneath the fretboard bears evidence of past work.  There was spruce loss under the fret board from past times when the neck, fretboard or both were removed.  As a result, this piece of the top came out in several pieces.
After the top section was lifted out, I had to restore the neck block to it's proper location.  The top breakage likely occurred due to failure of the joint between the top and the dovetail block.  Perhaps during a past neck reset, the individual doing the work loosened the neck block while steaming the neck off .  When string tension was put on the guitar, the block was able to tilt, taking the sides and top with it.  Over time, the mahogany sides assumed the new "shape" in the block area that was due to the shift, requiring that the block and sides be pushed back into their proper orientation before regluing.  I accomplished this by making a simple 'spreader' device from 2 pieces of wood, some threaded rod and 2 nuts.  The ides is that the wood on either end of the rod contacts the end block and dovetail block once inside the guitar.  A simple turn of the nut nearest the soundhole will provide outward pressure that is needed to return the block to it's proper location.  The original Martin factory dreadnought form provides a stop for the block on the outside.  Once the neck block was pushed firmly against the inside of the form, it was ready to reglue.  There was enough top left at the outer edgs of the block to provide adequate gluing surface in the absence of the missing top piece.
The 'spreader' in action...it worked very nicely to put the block into the proper position for gluing.
The block being reglued.  The upper soundhole brace also was reglued in a separate operation.  As you may have notice in the pictures, this D-18 did not have the "popsicle" brace, the wide and flat brace the apears between the upper soundhole brace and the block on most Martin guitars.
The top section that was removed had to be put back together, having been cracked in several places.  It was placed beneath a plexiglas clamping caul and glued flat.
After the top section was glued back into place, the top looked pretty much as it had before, which was bad. Not due to the current repair, but due to the old scars from past top work.  But a lot of that would go away when the neck was reattached and also after the rosette was repaired.  Old rosette material is not very flexible, so when it bends and breaks it is difficult to repair well.  Given that there was a lot of old rosette damage in the area of the cracks, I felt that the best solution was to replace the entire center ring.  Using a heat lamp (sparingly) to heat the center ring of the old rosette, I was able to soften the old glue enough to remove the center ring from the D-18 top without any further loss of spruce from the area between the rosette rings.  Using an old Martin D-18 top that still had it's rosette (the rest of the guitar is long gone) I peeled a complete rosette center ring to use as a replacement.  This allowed for a complete replacement of the original center ring with no evidence of past breakage (as would have been the case if the old rosette was repaired...see pic below).
The replacement  rosette, taken from an old D-18 top.
The new rosette, now installed.  After this operation was complete, I used bits of spruce from another old top to patch in the missing small pieces of spruce from around the rosette edges. 
The fretboard needed to be removed as it was non original, too thick and the wrong material.  After heating and carefully removing the board it was evident that yet again, the previous "repairs" had done damage to the original item.  In the case of the neck, the bearing surface for the fretboard was gouged up a bit and not flat.  After flattening the neck and reattaching the proper thickness ebony fretboard, the neck was ready to go back on the guitar.
After the neck was reattached and the bridge repaired (not detailed here, but the saddle slot was filled with ebony and re-routed, as it had been widened), a decision had to be made about the cosmetic damage to the top.  As I have noted, there was spruce loss, finish loss, old adhesive and other ugliness under those pickguards.  As was true with this instrument, if you see oversized guards on any guitar, they are usually covering up something ugly.  With such damage, there is often little to do but cover it back up if you don't want to refinish the top or part of it.  And I didn't want to do that.  After removing all the old adhesive from previous pick guards I made several attempts to color the lighter areas to an acceptable color to match the surrounding top.  At this point, the customer and I both hoped that a decent compromise of color touch up would make it possible to restore the proper size single pickguard to the top of the guitar.  This turned out not to be the outcome.  After several less than satisfactory attempts, the customer and I agreed that the best solution was to simply make a large double pickguard and cover the color problems and spruce tear out up again.  Not my ideal solution, but a top that has such cosmetic condition issues often leaves little alternative short of refin. Thankfully, the guitar still sounds thunderous even though the pickguards cover a large area.  The pickguards are cut at the soundhole to allow full view of the restored rosette, and there is little evidence of the damage that was previously present.
The material used for the pickguard is from Deep River Vintage.  It has very good color and texture, and looks far better than most modern pickguard material.

.

Repairs--For Sale--Custom Guitars--Tributes

Links-- Martin Warranty Work

Articles--Home