Can anyone tell me where I can find fine tooth hole saws? I have a JD Squared Inc Notch Master tubing notcher that works fine but the Morse Master Cobalt bi-metal hole saws that I got from Van Sant keep breaking the teeth off. I am trying to notch 3/4, 7/8 and 1" 4130 chromoly to make bumpers for micro sprints and sprint cars. Thanks in advance!!!