Clarinet: Beginner Guide — Music & Arts
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“The Clarinet is made up of three parts: the headjoint, body and foot. When connecting the pieces, the hole in the headjoint should line up in a straight line with the row of keys on the body. The main rod on the body of the Clarinet should line up with the middle of the keys on the foot joint.”
https://www.musicarts.com/cms/student-resources/an-introduction-to-the-clarinet/