If you find one, let us all know!
A fictional piece of equipment that a Red Arse or sprog is asked to fetch in attempts of the ship's company humour! Part of a toolkit of equipment intended to annoy sprogs - includes a long stand, left handed spanners and elbow wax.
Sadly, a glass hammer is now a real thing (its that wierd thing that you use to break windscreens). There have been no reported sightings of elbow grease or sky hooks.