Maybe you're going off on a tangent here Anthony? We'd been talking about Stilsons vs Mole grips somewhere previously and pointing out that Stilsons grip tighter the more you lean on them whereas Moles have no ability to increase grip so are more likely to slip under high loadings. Then, above, I mentioned Footprint wrenches which are much more akin to a Stilson in the way it grips in that the harder you lean on it the more it "digs in".
Compare these Moles:
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Which are basically pliers which you can lock on so they don't fall off the workpiece when you let go of the handles. But the important thing is that the locking force depends on how you adjust that big screw but once set and locked on the clamping effect doesn't change. Don't get me wrong, very useful tools, I use them a lot for holding stuff in place when welding. The handle often makes a good place to anchor the earth clamp.
Now here's a couple of Footprint types:
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You set the distance between the serrated jaws by unscrewing the pivot screw and selecting the nearest suitable hole, then reinstalling the screw. The rod/nut/bolt/whatever is located between the jaws and, looking at them as in the picture, you'd move squeeze the handles together, just like pliers, and then move the handles to the left - ie, turning the fixing in a clockwise direction. if the fixing resists turning then the teeth dig in more the harder you try to turn it. If you want to turn something anticlockwise you would turn thr tool over so the jaws are facing the other way, just like a Stilson. These tools, although working a bit like pliers because they "dig in" the harder you lean on them will undo stuff ordinary pliers and Moles will slip on.
I was mentioning the pattern made one's I bought in the autojumble? they are actually the pair on the left. I've looked closely and whereas the Footprints are clearly marked as such the other pair simply have a very small circle of writing on the top jaw - you can see it in the picture - which says "Made in Sheffield". Which I rather like as that may mean they are quite good quality - the teeth certainly seem well hardened! However I was mentioning somewhere above how useful that "cheapo" pair were because their jaws are much thinner so can get in between the ball joint and antiroll bar (or strut plate) to hold and stop it rotating while undoing the fixing nut on drop links. Look here at the difference in the width of the jaws and you'll see what I mean:
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Genuine Footprint on the right and the "cheapo" on the right. Most of the time the wider footprint jaws are actually an asset so they see much more use, but just every now and again the narrow jaws shown here come in very useful. You'll notice whoever owned them before me has lost the proper pivot screw on the cheapo ones and replaced it with a dexion nut and bolt. I've been meaning to do something about replacing it with something more appropriate and "classy". Now I'm a bit less mobile "running in" my new hip it seems like an exellent opportunity to search through my boxes of fixings and select something nice to complement it.
Narrow jawed "pointy" Mole grips? yes, they can be very useful in appropriate circumstances but a situation such as the problem with rusty drop link nuts they'd be about as much use as a ? well, you name it!