Just bought one, the seller is still going to ship it, but the nut broke on the low E string, so I'll replace it. I don't have much experience with this, I've bought the wrong one a few times, that's what I'm asking. My first option is always Graphtech because I can find it easy enough. I found two recommendations: PQ6010 and PQ6114, but I can find out which is the one that will work the best. Any ideas on which would be the correct one?