Springs for height adjustment. What are the problems?
If a compression spring is used for height adjustment there can be several problems associated with them. If the springs are loose especially when the pickups are adjusted lower as in the neck position on typical Stratocasters the springs can vibrate and cause a howling feedback. When playing at higher volumes or in close quarters with other instruments, various parts of the guitar can vibrate and produce unwanted sounds or uncontrollable feedback in your instrument. I d replace all the compression springs with amber surgical tubing 1/4 OD x 1/8 ID x desired length. It will help keep the pickups firm within the pickup slots.
