Neck/Truss Rod Question
I have owned and played an Ibanez Soundgear for 20+. I recently made 2 new purchases: A Schecter Omen-4 and an Ibanez Soundgear Gio. On the back of the neck on the Gio, it's like there are 2 pieces of wood, like the headstock is connected to the neck, but the wood there is coming up, like you can stick a fingernail in it.
The Omen-4 has the same thing but it's solid, you can't stick a fingernail it.
My Ibanez Soundgear that I've owned forever doesn't have that at all. Can someone help me out? I've attached pics to try and help illustrate.