1. Tighten the locking nut: If your guitar has a locking nut, make sure that it is tight and secure. A loose locking nut can cause the strings to slip, resulting in tuning issues.
2. Check the string tension: Make sure that the strings are properly tensioned. If the strings are too loose, they will be more likely to go out of tune when using the whammy bar.
3. Lubricate the nut and bridge: Apply a small amount of lubricant, such as graphite, to the nut and bridge. This will help to reduce friction and make it easier for the strings to move smoothly when using the whammy bar.
4. Adjust the intonation: Check the intonation of your guitar to ensure that the strings are in tune at every fret. If the intonation is off, the strings may go out of tune when you use the whammy bar.
5. Use a heavy-duty whammy bar: If your guitar has a flimsy or weak whammy bar, it may not be able to handle the tension created when you use it. Try using a heavier-duty whammy bar that is more stable and less likely to cause tuning problems.
6. Consider a different type of bridge: If you have tried all of the above solutions and your guitar still goes out of tune when using the whammy bar, you may want to consider a different type of bridge, such as a Floyd Rose or Wilkinson tremolo system. These bridges are designed to provide more stability and keep the strings in tune, even when using the whammy bar.