A tensioning rod, used for bracing in gates and at terminal posts May be threaded at one or both ends or contain a tightener or turnbuckle for adjusting tension
A curved metal bar implanted into the neck of a guitar used to adjust the amount and direction of bend in the neck
A rod inside an instrument neck that, when properly adjusted, counteracts the tendency for string tension to bow the neck
This is the name given to a threaded piece of metal that runs through the neck of MOST guitars and electric basses The rod is designed to help balance the tension between the guitar strings and the neck of the instrument By adjusting the truss rod, you can raise or lower the action on your guitar You can see it in the picture I drew for showing fretboard grime
This is a rod that is inserted up the centre of the neck during manufacture The rod can be turned (at the body end of the guitar) in an effort to straighten out the neck in the event that it is warped This should not be attempted unless you are sure of what you are doing, because adjusting it incorrectly can make the neck worse ! Bear in mind that I wouldn't try it !