impact wrench

[Dennis Clark <d-clark@pacbell.net>]

To prevent overtightening, if your impact is too powerful, use a torque 
stick. It's an extension that flexes at a predetermined setting and 
fools the impact into thinking it's tight. I use the black one (75 
ft-lb) then use my torque wrench to set to 80 (Honda S2000). I have a 
14.4v DeWalt, works great, forget how much it costs.

http://www.torquestick.com/

Dennis Clark