OK I'll admit "Sling Thingy" is a bit vague!
Just been in my shed, the sling is a Lift-Mate LM100. Made by the Hi-Lift Jack company. www.hi-lift.com
http://www.hi-lift.com/accessories/lift-mate.html
I use it a lot to lift my rig up onto the jackstands when I'm working on the car in the carport, way easier the the bottle jack
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