I got an old WW grinder Renegade 8hp wood chipper for a song on CL but it bogs down when putting any little amount of wood into it.(I am sure that's why the song) The engine runs great But the blades are as dull as a butter knife. I cant find any info on this chipper and WW grinder folded quite a while ago. I am sure if I sharpen the blades it will work good But I havent a clue how to get the blades out easily. Any ideas? they are a lot like rototiller blades with weights between. split at the ends of each one into two prongs.Do you/can you sharpen chipper blades while in or do they have to be taken off.Well if nothing else the engine was worth the price I paid.