Chainsaw Repair

I used to trip over these daily while working aboard aircraft carriers in the US Navy.

HLU-196B/E BOMB HOISTING UNIT The HLU-196B/E bomb-hoisting unit (fig. 9-23) is a lightweight, portable, gasoline, engine-driven unit. It consists of a gasoline engine, speed-reducing gearbox and brake, and a cable assembly and storage drum that incorporates a clutch and a boom. All components and controls    are    mounted    on    a    two-wheeled    frame assembly.  The  entire  unit  weighs  75  pounds.  It  has  a direct,  single-cable  lift  capacity  of  2,000  pounds.  A double-cable lift capacity of 4,000 pounds is obtainable by  using  various  trolleys  and  rack  adapters  that  are available. You can extend the cable by disengaging the clutch   and   manually   pulling   it   until   the   necessary length is withdrawn. To reel the cable in, you must start the engine, engage the clutch, and carefully throttle the engine   to   control   the   reel-in   speed   of   the   cable.

http://navyaviation.tpub.com/14313/css/Hlu-196B-E-Bomb-Hoisting-Unit-209.htm