I wouldn't trash that grind. It looks good, just not a 120
I'd just start with a new blank...they are cheap enough that it won't matter too much to start over completely new.
You'll end up loosing too much of that graver trying to go from 70' to 120' that it'll be like throwing it away.
Agreed, and if your starting that there is easier to control than a 120.it shows as a very well developed cutter. as others mentioned, to me it looks about half of a 120. how well does it cut-- that is what counts !