HF has their SDS rotary hammer on sale for $59. If you dont have a SDS -go buy it!. I have had one for over a month now and you will find yourself wondering how you got by without one. I have used it to set a dozen or so 5/8 anchor bolts in concrete (30 seconds to a minute a bolt to drill) drill holes through a concrete wall for conduit, used it with the chisel it came with in hammer only mode to break up concrete. Next I have to install a TON of tapcon screws. I was at HD today and discovered Bosch makes a SDS tapcon driver kit! I am in heaven..........

that you didn't have a top notch roto hammer.