Harmony H165: Patrick Ogle's Harmony In Pieces
Recently, Patrick Ogle took his Harmony H165 into Third Coast Guitar Service to have some work done on the neck. In this video, we see Chris Eudy and both separated halves of Patrick's Harmony as Chris explains what happens to dovetail joints as they age.
Apparently, dovetail joints are a lot like people.
CHRIS EUDY: You can see this is the -- This is how most acoustic guitars fit together. It's a dovetail joint, right? So, it looks like a little dovetail that's why they call it a dovetail joint. And here's the other end, all right?
PATRICK OGLE: And you're saying it was -- it was some kind of --
CHRIS EUDY: Well, what happens -- This is what happens to every acoustic guitar over a period of time is the dovetail shrinks. The male end of the joint contracts that way, right, and the female side wood shrinks as it gets older, and it contracts this way, and so there is a gap essentially created in the wood, and the wood can only hold it for so long. So eventually then the neck starts -- you know the neck is sitting in the guitar like this, and everything kind of goes loose, and the neck -- this is an exaggeration -- the neck goes [VOCALIZING A "WARPING" SOUND] like that, so that it changes the angle that the neck fits into the body, and thus the strings get really high up off the fingerboard, and no matter what you do to lower it here, it just can't get low enough because the neck angle has kicked up too far this way, right? So that's why that we're talking about when we're doing a neck rest on the guitar. Somebody at some point though that, you know, they would just put some putty in there that there was just a gap and they were just going to put some putty in there so you see that stuff all the time.
PATRICK OGLE: Especially on a cheaper guitar.
CHRIS EUDY: Well yeah, yeah. People think that, you know, it's not worth it and we'll just put lots of sheets of epoxy and, you know, kind of clamp it back down and it doesn't -- It doesn't usually work because there's -- An acoustic guitar has about 178 pounds of pressure on the neck so, you know, that's a lot of pressure.
PATRICK OGLE: Right.
CHRIS EUDY: And you know sometimes, older like this one took a little bit of the wood with it because this glue didn't want to let go, or else they may have used an epoxy to put the fingerboard down to the top of the guitar, and you know we have enough to fix stuff like this.
PATRICK OGLE: And it doesn't go all the way through. It's not going to affect the sound.
CHRIS EUDY: Not at all. We'll glue everything back together again and since it's underneath the fingerboard so you don't see it.
PATRICK OGLE: Mmm hmm.
CHRIS EUDY: But yeah, I don't know with the resolution and lights on the camera but you can see that where we steamed it off. This is where you can see the little white patches just like on old furniture or something where the steam comes out the sides, and we'll sand and buff that out and you won't see any of that. But the technician will go back in and we have shims. They are pieces of little mahogany hardwood that are glued in here and here and then this is all the glue and stuff that's cleaned up into this area and then pound the neck back in until -- and then shave the sides of it with a chisel until it fits really snugly and ostensibly we should be able to set the neck into the guitar, put strings on it, and tune it up to pitch without any glue, and it should play great. The only reason we really put glue in it so that it lasts longer than a couple of weeks because otherwise then it would get loose. So, you know, once you get a tight dovetail, it should stay pretty solid for, you know, 20 years or so.
PATRICK OGLE: Okay.
CHRIS EUDY: But we don't have the brace in it yet. We're just gonna put the brace in there, probably before we place back the top, before we piece the guitar back together again because it would dangle and would be wrong and weird if we didn't put the brace back in there when we put strings on it. It would kind of pull it kind of funny. So, that's what's going on with it right now. It's in pieces.
PATRICK OGLE: All right. Thanks.





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