Professional Tenor Saxophone by LAMPLOCKER - High-Quality Brass Instrument for Jazz, Band & Live Performances - Perfect for Students & Professional Musicians

Made from safe, non-marring rubber, Lamplockers are
slotted to easily slip over the lamp cord and are then insert into the neck
receiver or bore of the instrument. The hole through the center of the
Lamplocker is large enough to allow the cord to easily slide through it for
repositioning of lamp yet provides enough friction to hold lamp in position.

lamplocker - side view

lamplocker - top view