What do you do when an open-end wrench is a bit too large for the nut or bolt you’re trying to loosen or tighten? This happens when working on a metric fastener and you’ve only got a standard-size wrench or vice versa.
Well, you may have heard of the trick of using a metal washer or coin to fill the gap in the wrench. And while that does work — sometimes — there’s a better solution.
Place the too-large wrench onto the nut or bolt and then jam a slotted screwdriver into the gap between the fastener and wrench.
The wedge-shaped tip of the screwdriver tightens up the fit and really locks the wrench into place.