Ok I know this forum is more oriented towards electric guitar, but I'm desperate. I bought a new set of acoustic guitar strings today and decided it was about time to change them (I've never replaced acoustic strings before). I consulted a website and decided I could handle it. So I used pliers to pull the pin out of the bridge and took off the sixth string, but now when I try to put the pin back on, it won't stay! No matter how hard I push it won't stay locked in there. Help!