[ikabw]

My Sennheiser 558's have served me well for a year or so and I don't have warranty as I bought them used but recently the channels have been dropping out more than not and I'm constantly fiddling with the cable, I opened them up and I'm pretty sure the culprit is the jack that the 2.5mm plugs into(see picture) when I rotate that I can fix the connection temporarily until it gets bumped or moved, does anyone know how to fix this or where to find a replacement?
 
http://i.imgur.com/CpmKo8Z.jpg