Unless someone performed some sort of "unorthodox" repair on your neck, you should have that screw.
Here's an iFixit tutorial detailing how to replace a neck cork on exactly the same model you've got (i.e., a YAS-23). It points out the location of the screw. Of course, you don't need to use a self-adhesive cork like the one shown in the tutorial.
Here's an iFixit tutorial detailing how to replace a neck cork on exactly the same model you've got (i.e., a YAS-23). It points out the location of the screw. Of course, you don't need to use a self-adhesive cork like the one shown in the tutorial.
