INDIVIDUAL WAS DOING TORCH WORK IN THE BAG OF THE FEEDER. ON TWO OCCASSION SPARKS WENT DOWN HIS CLOTHING CAUSING HIM TO JUMP OR EACH TIME THIS OCCURRED HE STRUCK HIS RT KNEE ON THE FEEDER. THE KNEE BECAME SWOLLEN AND PAINFUL OVER THE NEXT DAY. HE WORKED ON 1-18-02 BEGAN MISSING ON 1-21-02.