Sharpen convex edge on round knife

[Squilchuck]

I thought I'd seen plenty on this topic a year or more ago, but can't find anything. What's the best way to sharpen a convex edge on a round knife without machines?  Sandpaper on a mouse pad?  I have a Ken Onion Worksharp but I find it tricky w a round knife. Is there a round knife technique for this machine?  Is there  a better machine for convex edges?  Thanks. --John 

[mike02130]

I mark the edge with a Sharpie then put it flat with the blade hanging off the bench, and use stones.  I have better control moving the stones than I do standing up moving the knife.  I sit on a stool and have my eyes closer to the task.  It's the same way I sharpen an axe.