If you only have a Sharpmaker at your disposal I (personally) would not dull the edge and then try to re-profile. In the absence of pictures I'd say the best bet is to keep working the flats of the diamond rods until the "dent" (more than likely a 'chip') is gone and then go into a more routine sharpening process to get the edge you want. I guess what I'm saying is that, in the end, the same amount of material will have to be taken off in order to restore the edge beyond the chip, so it doesn't matter how you go about it, , , ,but I'd just assume maintain the edge profile throughout the process rather than having to re-establish the bevel all over again. Working with an Edge-Pro may offer a little more latitude in how to go about this, but using a Sharpmaker will still work well, , just take longer. I'm sure others will have additional insights.