Hi there. I have a Gibson M3 and it should have 2 or 3 springs depending on the string guage you intend using. It should all sit square but check with a reputable dealer as it may have been adjusted to compensate for the heavier wound strings or set up incorrectly. It is very easy to goof up the spring tension settings if you don't know what you are doing. Personally I found it difficult to maintain string tuning using the tremolo arm setup so resorted to blocking the bridge inside with a piece of brass which can be removed. I also found that the intonation hadn't ever been set from new when i bought the guitar in 1996. It never played in tune and i was almost at the point of getting rid of it when a friend observed that the bridge had never been adjusted. Having adjusted the intonation after fitting a new settled set of strings i adjusted the intonation with a really sensitive electronic guitar tuner. It now plays perfectly in tune and stays in tune after playing. I used to play a Yamaha SG2000 as well, which was extremely heavy to handle. In comparison the Gibson M3 is light, easy to play and has a fantastic range of sounds and is a really lovely guitar to own and use. I will never be parted with it.
