Introduction
If a faulty tuning machine on your Sterling by Music Man-StingRay Ray4HH Electric Bass is preventing you from tuning - it's time for a replacement.
This guide can be used to replace non-functioning tuning keys for your Sterling. Before starting the disassembly, make sure to acquire the correct tuning keys and type of string.
Steps 5 & 6 require the use of a drill- it is important to be aware of your environment and take caution.
Tools
Parts
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            Turn the tuning key counter-clockwise to the loosen string. 
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            Continue turning until there is slack in the string. 
 
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            Cut the desired string with needle nose pliers. 
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            Remove the string by threading out through the bottom of the bass. 
 
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            Use a Phillips #1 screwdriver to remove the four 9.53 mm screws. 
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            Remove the broken tuning key. 
 
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            Adjust the direction of the replacement tuning key as need. 
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            Line up the screw holes of the tuning key to the existing drill holes on the bass. 
 
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            Thread the string through the bottom of the bass to the new tuning key. 
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            Loop the string around the tuning peg-three to four times-until tight. 
 
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This guide will work for any of the tuning keys on a Sterling by Music Man StingRay.