This is good. One can do it any of those ways. I do mine like st8yd. Buck sells a pen size diamond rod, which has a collett and the rod telescopes out. One end of the
round rod is tapered small to larger round with diamond grit. The other half of the rod is half round, flat on one side, ( straight walled).
This works great for touching up the divots on a serrated blade. Then after working each divot I take it to a stone and work the flat side
of the blade with edge leading strokes. Just a few light strokes maybe 3-4, no lift, just laying flat. Then I'll test the divots on push cutting paper.
When finished they should be able to pull this cutting off. A serrated blade is a very specialized blade. I have experimented, trying to think of
different task to use a serrated blade for and some of this was disappointing. But I did find it was good for cutting tough stemmed weeds, rope,
filleting fish, slicing bread and fruit and some meats. Not chicken, roast or brisket but it does have a place in cutlery. If you have discovered another use for this style blade. This is a close enough topic to write about it. Thanks, DM