Please Visit the Web Sites of the Craftsmen mentioned on this page, and if it is appropriate send them some of your business.  The resources they provide are great tools for learning about your violin.  No compensation has been provided to me by them, nor is any expected.  I have no connection to them other than a profound admiration for their work.
The Pegs
Just One Part of
Tuning Your Violin
We use the pegs to tune the violin.  The four pegs, one for each string, are located between the scroll and the nut.  They are inserted into the violin so that they extend through the peg box and just barely come out the other side.  The picture at the left shows you the location of each of the pegs.
Each peg has a peg hole.  A string is inserted through the hole, runs through the nut, over the fingerboard, across the bridge and is attached to the tailpiece.  If we turn the pegs, we tighten or loosen the strings.  The tighter we make a string, the higher the note.  The looser we make the string the deeper the note.
Pegs are traditionally made of ebony, but they can be made of either boxwood or rosewood.  They can be plain or they can have ornaments or inlays on their heads.
Some violins are a little easier to tune because they have a fine tuner on the tailpiece for the E String, or a tailpiece with fine tuners alreade installed for all the strings.
This means that if you get the string close to in tune using the pegs, you can make minor adjustments with the fine tuner to make the string perfect.
Violin Pegs
There's more to pegs than you might think!