That’s correct, that is a way to tell, I was simply proving that your previous information is not correct as I have a NIB 12mm saw that your information tells me is a 10mm. You know your saw hasn’t been drilled and tapped? I assume you have owned this saw since new then. Otherwise you can’t possibly know this. I have been a toolmaker/mechanical engineer for 25 years, I assure you, if those holes were drilled and tapped from 4mm to 5, you’d never know it. I was simply helping answer a question you had. If you want to disagree with the answer, that’s your call. I’m sure you know way more about saws than I do, I was simply just trying to help you tell the difference.