First of all, let’s get familiar with the parts of the flute, if you aren’t already. There are three main components to a flute, which you will see pictured above: the headjoint, the first piece; the body, the middle and largest part of the flute; and the footjoint, the piece on the very end. There are two common types of footjoints, the C footjoint and the B footjoint. The one pictured is a B footjoint. It has three keys, whereas the C has two.
Before putting the flute together you may want to check the distance of your cork in the headjoint. Often the cleaning rod will have a nick in it, indicating the proper distance that the cork should be from the center of the lip plate hole. Insert the end of your cleaning rod, as demonstrated in the photo. The nick should be exactly in the center of the opening.
The first parts we assemble are the body and the headjoint. Grasp the body of the flute with your right hand, carefully holding onto the part above the keys as shown in the photo. Do not hold on to the keys.
Now, gripping the headjoint with your left hand in front of the lip plate, gently wiggle the headjoint into the body of the flute. You will not want to push the headjoint all the way into the body; most flutes are in tune when the headjoint is about ¼-inch or so from being completely pushed in.