Finally we're ready to refret the 0-18T!
I took some measurements of the old frets compared to the new ones and found that the tang was about .029 in. compared to the new ones, which are .023.
I'm doing a compression fret job to correct the upbow of the neck from the first to about the fifth frets. What this means in a nutshell is that we'll put frets that have a slightly wider tang than the fret slots, so they will 'compress,' or force the neck into a backbow. Then under string tension, the neck will be pulled straight.
And by slightly wider, we're talking a thousandth of an inch or so.
The new frets' tang measures .023 inch. So ideally we want to have a tang width of .024 of an inch or thereabouts for the compression. But since the old slots are about 5 thousandths (.005) too wide, I'm going to fill the slots with ebony sawdust and then make newish slots.
The saw has two blades - one for the push cut and one for the pull cut. Very handy, and a lot easier to control than the slotting saw.
This job is looking like a Stew-Mac ad. I really, really would like an endorsement deal.
This is ok, not a problem at all.
The main thing is that they are no longer .029 wide, which is where they were originally.
Although the fretboard is flat, I want just a small radius on the wire so the ends will sit into place before the frets are pressed in.
A gentle squeeze with this fret tang tool will make the tang compress and get a tiny bit wider.
I found the tool does leave small tooth marks on the crown of the fret, but they disappear when the fret gets dressed.
After a bit of squeezing, our .023-wide tang has become .025!
Exactly what the doctor ordered for our .024-wide slots.
I think this might work!
This tool is great, but I have to relearn how to use it each time I do a fret job, since I don't do a lot of them.
Note that I have strings on the guitar - I installed a few frets and then tuned it to tension to get an idea of how the neck would look under tension before I put all of the frets on. It looked good with just a few frets installed.
Note that I have a brace jack inside the body to support it. I did see plans for an elegant fingerboard support online and I want to make one. But for now, the jack works perfectly well.
The neck looks good and straight at this point.
I'm leaving some details out - some of my older posts have more detail on this process.
I also used it on the bridge, which is also ebony.
It plays really well now - and sounds great. The neck is a bit chunkier than my other 0-18T.
In the next post I'll have some pictures of the completed guitar.
All posts in the 1931 Martin 0-18T Restoration Project:
- 1931 Martin 0-18T Guitar Restoration and Repair, Pt. 1
- Neck Removal on 1931 Martin 0-18T Guitar: Restoration and Repair, Pt. 2
- Trimming the Neck Heel for Reset: 1931 Martin 0-18T Restoration and Repair, Pt. 3
- Shimming Guitar Neck Dovetail and Finish Chip Repair: 1931 Martin 0-18T Restoration and Repair, Pt. 4
- Caul for Heat-straightening Guitar Neck: 1931 Martin 0-18T Restoration and Repair, Pt. 5
- Reparing Acoustic Body Cracks: 1931 Martin 0-18T Restoration and Repair, Pt. 6
- Making a Tortoloid Pickguard: 1931 Martin 0-18T Restoration and Repair, Pt. 7
- Heat Straightening Bowed Guitar Neck: 1931 Martin 0-18T Restoration and Repair, Pt. 8
- Fret Marker Installation and Filling Fingerboard Chips: 1931 Martin 0-18T Restoration and Repair, Pt. 9
- Compression Fretting to Correct Upbow: 1931 Martin 0-18T Restoration and Repair, Pt. 10 - This page.
- Completed 1931 Martin 0-18T: Restoration and Repair, Pt. 11