In today's post, the writer discusses the Cogsdill deburring tool, which some people swear by because you can do it all in one pass. There's some merit to that if you've ever deburred large skins; you have to do one side, turn it over and then deburr the hole on the other side.
The writer is not impressed, however:
The RV tool kit does not include these deburring tools. The reason for this is that the rivet holes can be easily over-deburred with these tools. This causes the cleco temporary fasteners not to hold after the rivet hole is countersunk.
Personally, I don't believe that Van's "overemphasizes" deburring. In fact, I think they've gone out of their way to caution against it. A couple of turns, is the advice I've often seen.
But what confused me about the post is making an apparent reference to using a deburring tool to create perfect holes. That's not what a deburring tool is for.
For more information: PlaneTools.com - When clecoes don't hold due to over-deburring. This company -- Isham -- recommends you not use a deburring tool at all. Oh, now you tell me.