I bought a new 2009 Les paul custom. About 6 months later I noticed a crack on my bridge vol. knob. So I e-mailed Gibson and they said send them pictures. I sent them pictures and they sent me a new set about a month later. I guess no two sets are the same because I could feel a difference in the taper from the old set and the new. I put the new ones on and in about a month later my bridge tone knob had a small crack. I just want to say I am very gentle with my guitars. I know I might sound anal but after spending 3 grand on a guitar I don't want to have any problems. Let me know if you have experienced any problems like this???