That's what I did initially, but I found when cutting some frames that I wasn't getting a perfect 45 angle. By doing test cuts and small adjustments to the stop mechanism I was able to dial it in perfectly (not required if you're only using it for general carpentry, but essential for building fine furniture, etc.).
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Thanks, I think I might try that. I've got a nifty digital angle gauge, might be a good time to test the accuracy of that thing too.