Alan Carruth wrote: Did you scrape the under surface of the bridge just before gluing it?
That might be that ¨something else¨ I mentioned in my speculations about why??
I did that last may and as far as I remember I did not glue the bridge on the same day so I might not have done it.
Alan Carruth wrote:The other is to make the gluing surface slightly concave from front to back
That is how I make them, also this one.
Alan Carruth wrote:You probably know most or all of this, and I hope you won't take the reminder as criticism.
Some it was and some was not but your explanation certainly made it more clear for me and I am very grateful for your help.
Alan do you think cleaning the surface with acetone before glueing is unnecessary?
Steve Ganz wrote: I agree that it does look laminated not solid.
Titebond on the top is colored by the rosewood.
Simon explains it here
This puzzled me for a good while too … Eventually I figured it out.
What looks like mahogany is the glue layer having taken on some colour from the Rosewood. The spruce on the bottom of the bridge corresponds to small pieces from the top where the glue did not let go. The "white spots" in the "red glue that looks like mahogany" are the holes left in the spruce in the few spots where it failed rather than the glue. Once you figure out what you are looking at it matches up perfectly.
Sean Winkler wrote: look like the corners are snipped off a bit.
That's right. The guitar had been in a case when it happened so the wings have hit the case when it flew off and small pieces of RW about 0.5 mm in width has torn off from the rear side if the bridge in both ends.