Introduction: Close Quarters Impact Wrench
I was in a tight spot under the hood. Not enough torque on the wrench. Not enough room for a cheater bar, or pneumatic impact wrench. Not even enough room to swing a hammer.
The solution? String a bicycle chain through the closed end of a combo wrench, and through a barbell weight, lock it with vice grips, and hammer away with the weight pulling the chain. It works.