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How can I fixed a bosch PSB 1000 jammed screwless chuck that has locked in ?

How can I fixed a bosch PSB 1000 jammed screwless chuck that has locked in the open position?
R Delaney, October 2010
put the back end of the chuck in the jaws of a vice ,then use a pair of adjustable grip pliers on the front half of the chuck and turn it clockwise .

wirecutterman, October 2010
link Click here to see other fixes for Bosch.