Grinding off the hammer spur will essentially make your standard revolver a DAO. Yes technically you have a hammer that could be cocked if you can get your thumb in front of it as you are pulling the hammer, but that's not likely to happen accidently, and if your preference is for DAO, why would you try to cock it up ?
And yes, there will be a bit of extra notchiness in the trigger pull, from the cock-sear, but in a continuous trigger pull, you'll pass that almost unnoticed.
I used a dremel tool, a palm sander, and a belt sander to cut off the spur, sand down, and hone to a nice finish the back of a 2" M64. It worked out just fine.
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