I used to have one with my KL. God, how I feared that device, and it knew it too. The truck would start, and the handle would spin around and give a whack in the elbow so hard you thought you had lost your arm. After doing the happy dance whilst singing various curses, attention would turn back to the truck which would usually be sitting there purring away, indifferent to all your problems.
My advise: For sure, have on in the collection. But resort to booster cables or tow straps for starting.
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