Originally Posted by 220@NAP

Personally, I would sharpen them front-to-back, or vice versa ... either one would be better than side-to-side.

Keep in mind, the Hellrazor is made from a very sturdy stainless steel. That makes both the head and the blade edge extremely "durable", but can also require a little more time to get that edge back to "scary sharp" if wear and/or dings along those edges are prominent.