Below is a video of a NW Ohio USAR training a few years back that I just found on my computer and loaded to youtube.  We were in an old mill facility (type I construction).  It was a great training ground prior to demolition.

In the video you will see the jackhammer tip being held up by a rope with a prusik hitch.  The prusik makes it easy to adjust where you want the working end of the jackhammer to be.  This can also be accomplished with a tool being held by two personnel.

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