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The Sharpmaker is indeed the tool for the job, but you should practice on something else to get your moves down. It takes a couple of weeks.

You can start with the corners of the greys if necessary, btw. Just stay off the flats. My advice: start light with the greys, finish with ultra-light pressure on the whites.
 
a sharpmaker is just about the best thing you can get to sharpen recurve blades. Use just the corners of the stones.
 
Check out this thread. I have it bookmarked,printed out and highlighted. it is very informative and a must read for recurve blade owners. many thanks to Joe Talmadge this has saved me and my Boa from certain peril at the hands of a lansky set. :D Looks like you have an excuse to get a Boa now to practice on after all you don't want to ruin a $600 knife like you said right;)

http://www.bladeforums.com/forums/showthread.php?s=&threadid=90315
 
Remember that your TNT is Talonite and not steel. You really don't want to grind on it any more than is necessary. Most of the time all you need to do is to realign the edge a little and a smooth steel or maybe a ceramic rod might be all you need. Tom Mayo's edges are convex in shape, so you need to consider that geometry fully as carefully as the recurve. If you lay in a fixed bevel, the knife will not cut as well as it did when you got it.

If the knife gets seriously dull, beyond what might be easily dressed, I suggest you contact Tom about sharpening it.
 
I think your idea of freehanding the approximate angle on your Sharpmaker is a good approach. Go over it a few times very lightly with the finest abrasive. You likely be able to "feel" the edge when you go over it. A smooth steel should work fine. Don't use a rough steel though; it'll shave off a lot of that expensive Talonite.

BTW, your estimation of the "final" angle is probably accurate. One advantage of the convex edge is the ability to use a slightly more robust edge and get the same or better cutting efficiency.
 
ultimate edge makes a convex diamond rod for about 15 bucks. it is awesome I have done some kukris with it and it works extremely well.

freehanding is the best way to go. ya' just gotta learn.
 
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