That seems to be the best guess yet , here is a high tech version of a cable tool http://tmt.stores.yahoo.net/cablecaster.htmlbclinehand said:Mebbe a launcher for shooting a light pulling string across the top side of suspended ceilings ( or other such hard to get at spaces) and then use that string to pull wire or communications cable..........grasping at straws here......springy thing under barrel could be a support for a spool of light string