Beat it on a piece of hardwood plywood instead of the concrete. I know that sounds terrible but there's no way around it. The plywood takes a slight amount of shock and impact out of it. Things don't wear out as fast collet and plastic both.LOL....the "nose" on my RCBS puller has been reshaped with my many, many thumps on the garage floor. Yes.....I've also gone through my share of collets. My last replacement set, I found/bought at the local Sportsmans Warehouse.