Hey guys, I have a Honda Civic DX 2005 and i'm having a real problem with my driver side door. It wont lock!! I'm going to take it to a shop on Monday but I did wanna mention some stuff.

I noticed this tiny cylinder had come off the door when I was installing my door speakers. I'll upload a picture of it now. But could this be a very simple case of reinstalling the cylinder to fix it? Cuz then, maybe i'll just do it myself.