Just wanted to know if some one could tell me the best way to get the "knockout" out of the saw blade? My skil saw has a diamond shaped arbor and the blades all come with a round hole with a diamond shaped knockout. I tried to pound it out with a hammer and chisel and also a pair of needle nose pliers. I only succeeded in distorting the blade and had to throw it away! Please help. Thanks in advance, Waipahe.