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I was thinking the same and bought a metal drill bit for 5/8" and tried drilling a hole. I spent 30 minutes on the first hole and I was only able to get 1/8" down. A machinist friend of mine said the blade steel was too hard and I should go to a professional to find an edge with the right bolt...

Hello, I have a 72" scrape blade with __9 bolt holes__ edge and a spacing of 3.5", 2.5", 10.5"(5 holes), 2.5", 3.5". The bolts are 5/8". I bought it used and it has no manufacturer or model number on it. Has anyone run across such an edge and can tell me either who the manufacturer is or...