Duramaxx Dr. Jones Mode D'emploi page 30

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3 Loosen the lock nut on the other end of the center tube, then push the
silver button on the top tube and insert it into the center tube. Then
tighten the lock nut again.
4 Adjust the full length of the detector so that your arms are straight when
searching. Once the desired length has been determined, tighten the
locknuts. This makes detection easier and more comfortable.
5 The armrest has three positions. Use the triangular fixing screw to secure
the armrest in the correct position, depending on the length of your arms.
Silver button