Andrew, Dave is right; you need an impact wrench and it should have an adjustment available on it to change the tightening torque. I use mine all the time but for I'm not sure the cost of the wrench is warranted for occasional use. I would suggest money will be better spent on a simple spider but when tightening the nuts, and always without fail use a good "click" type torque wrench...which will also be used elsewhere. Don't overtighten wheel nuts as it's a sure way to end up with warped discs.
Garth.
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