I have one dilemma , and I hope that you can help me.I need to change tuning keys on my Ibanez GAX30 /the plastic ones I got with the guitar don't function anymore/.I talked to people in several music stores and I was told that the best thing I could do is to buy "Sperzel" keys/approx. 70 US $ for a set/.I'm uncomfortable with the idea,coz I know little about the keys,and I realize that they function differently than the "classic" ones.Since there are,also,different types of Sperzel keys ,which one should I choose for Ibanez GAX 30/if any/? Also, I'm uncomfortable with this coz Sperzels are to be attached with one screw only,and my guitar has 2 holes for each tuning key,so I don't know if that would be o.k. The number of string warps would be reduced,too, due to the different way of functioning.I was hoping that you might help me with this issue .What do you think about Sperzel keys? I would like not to have problems with keeping the guitar in tune as often as I already had .