i did an experiment where i took two iron edger blader used the impact wrench took the nut off and added another blade in a + style and guess what? it works like a charm! i can get the heavier grass runners cut in one shot instead of backing up each time. make sure that the circle is lined up with the original holder. boy it sure has more power in cutting wise i will be watching out for any over heating and need to put in more grease at the end of the gear tranny deal. so who else has done this?