Recently I've noticed that my guitar (classic) has some crack on the top of the neck, precisely where the neck connects to the head. I've doing some research and it seems that it's not a big deal, and it's absolutely solvable. My doubt is the following, I've been told that in order to fix it one would have to open the crack and glue it. In this case the crack seems very small and I'm worried about following that procedure. Of course a Luthier would do it, but I don't know if it's the right thing to do, or there's some easier way (and cheaper ) to solve it. I'm attaching some photos to illustrate the problem.
Take it in and let a pro do it. How did this happen? Was it a surprise when you found it or did you knock it over and cause the split? I have a home made Les Paul (I made it) that I knocked over twice. The first time the head stock split but did not open, as a result the wood grain fit perfectly together like a jigsaw puzzle. My dad (a Luthier) and I fixed it just as you mentioned, we gently separated, or opened, the split and filed it with glue (don't recall if it was wood glue or epoxy). However, the second crack was not clean, like a compound fracture with shards of wood poking out that did not fit back together properly. That time we fixed it but it's very sloppy. The Luthier will have to check to be sure it's a clean break. From the pics it almost looks like the crack is only in the finish. Is this the case? Or is it really in the wood too?
I do not know of any other way to patch a split in the wood.
It looks like it's being held together by the tension of the strings, which isn't too bad a scenario. It could stay like that for years!
However, if you need it fixing, an obvious is take it to a luthier. I've repaired several breaks like this, and yes, the split needs to be opened up to get the adhesive (generally epoxy resin two pack) into the gap, to contact as much material as possible. Then clamping hard till set.
If you feel brave, have a go yourself. Open up, and put a small wedge in before applying adhesive, so it penetrates as far as possible. I've had heads come off completely, that have been successfully repaired, so this looks 'not too bad'.