EE STRAINED LEFT SHOULDER WHILE USING A ""POKE POLE TO DISLODGE KAOLIN CLAY WHICH HAD BRIDGED OVER IN A SHREDDER HOPPER. THE ""POKE POLE"" IS A PIECE OF 3/4"" IRON PIPE ABOUT 10' LONG. IN ORDER TO DISLODGE THE KAOLIN, THE POLE MUST BE LIFTED UP AND DOWN. EE INJURED HIS SHOULDER WHILE DOING THIS.