When the assembly stage is complete, the craftsman will insert a small "leak light" into the body of the horn, to see if there are any leaks around any of the tone holes.
組裝完畢後，師傅們會將一個小型燈管放進薩克斯風管內，逐一檢查每一個音孔是否有漏光不密合的瑕疵。