Oh your right I have one of those somewhere in my toolbox too. You put the bit in it then smack t with a hammer and it turns it like a 1/4 turn with every hit. In the airforce we used a johnson bar to get stuck strip screws out of the panels. it looked like this.
http://www.toolsource.com/brutus-joh...-p-117473.html
But you had to have another screw hole to anchor it into.
Found a pic of impact driver too
http://www.bing.com/images/search?q=...=0&FORM=IDFRIR
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