Stay In Tune...
Kahler tremolo systems are known for staying in tune no matter how you abuse them. That's no lie. But heavy tremolo use and bombing techniques can eventually wear down even the best metals. It's called metal fatigue. That's where most tuning problems can be found.
#1 reason: String lock or locknut is grooved or worn out. 80 % of the time this is why when you pull back your strings go flat or when you divebomb and your strings go sharp. This problem is most noticeable on pullbacks. Check the clamping plates and the string lock base for channels or grooves cut into the metal by the slipping strings. Replace if grooved. Also the nut must be lubricated with white grease. This prevents the winding from chinking back and forth over the nut during tremolo operation and creates a smooth slippery slot for the string to slide on. Graphite nuts work great!
#2 reason: Metal fatigued or rusty return springs. How can you expect it to return back to center if its got weak return springs? Replace every 5 years of average use.
#3 reason: You need to put a 45 degree bend in the wrapped windings next to the ball end. This prevents the string from spinning in the string hook, and reseating due to string slack during deep dives.
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