I have a buggered up limit screw on my 2006-ish Chorus rear derailleur. I can't find anything similar in the bottom of my various parts boxes. Am I likely to find something adequate at the hardware store ?? I'm thinking finding a screw with a small enough head to fit into the body might be tough. Otherwise I guess I could get any old screw, purposely too long so I don't have to worry about the head fitting in the body, but then the tension spring will be too short.