So a few months back i purchased a 375 Adamas Fixed blade and it came new out the box with the spine serrations completely non sharpened so I sent it to Benchmade and they did some lame attempt, at least brought them to an (sort of) edge. They just touched the tips of each serration mind you, not the concaves between each serration. I really want these things to be usable to be sharp! So I just ordered a Smith's Diamond Retractable pen 400 grit thingy. Will this 400 grit rod suffice on the D2 spine serrations on the 375?