[Sam Knopp]

I sent the audio and video files to Ian, and he has posted them below as a zip. Hopefully, you can access them. You are correct in that the pulsing is similar to the “beats” that you get when tuning two notes that are very close to the same. If this sound was constant, it would be less noticeable, and might be considered a resonant “shimmer”, but since it pulses, it is quite annoying.

[Sam Knopp]

Thanks for the suggestions. I have never used hide glue so I don’t have all the stuff for working with it, but I see that Titebond makes a liquid version in a bottle that doesn’t need mixing or heating. Is that an acceptable version? It also looks like it has a brown tint, and I’m concerned about the glue showing discoloration of the top, due to the fact that my patch will not be perfectly shaped and glue will show around then edges.

[Sam Knopp]

Thanks for the info and offer. I am unfortunately about as far from you as I can be and still be in the US. (San Diego area). I’m still experimenting with the thin wood patch and having some success, but the issue now is that the glue that shows around the patch due to the inexact fit is slightly discolored. I’m still experimenting with different glues, but I’m learning that “clear” and “transparent” on the label does not mean invisible. Such is life.

[Sam Knopp]

Thanks Dave. Unfortunately, this is a sonic rated soundboard from Pacific Rim Tonewood and I have already thicknessed it to the ideal thickness for its sonic characteristics. This tearout is deeper than I have ever experienced (probably at least 0.75 mm at the deepest) and sanding it smooth in a large enough area so the depression is not noticeable could compromise the strength and sonic aspects of the soundboard, in my opinion. I am experimenting with creating a thin shaving of wood from the scrap of the soundboard and gluing it in to the tearout, and then sanding smooth. But I am wondering what glue can be used that will be transparent because my patch will not be perfect and some glue will show.