Yes, Cathy and Rob are spot-on here - forgot to mention that you should fill the crack, not force it closed again. See Terry’s site for details on this.
A good-working method of filling the crack is as follows:
- Place a broad line of epoxy or superglue on the crack. Superglue might be better for that as it’s not as tenacious as epoxy glue.
- Close the barrel on one side (with your hand’s inner surface for example) and suck on the other side. This draws the glue into the crack.
- Clear off excess glue on inside (!) and outside
- allow plenty of time for the stuff to harden. You might glue your flute together if you don’t allow enough time!