Bob,
I haven't had a chance to actually hold one of the Helix broadheads in my hand yet but I'd bet the knife sharpener would work very well with them. The only doubt that I have from looking at the picture is that the factory bevel looks VERY steep...like 40 degrees or so? Might just be the picture though. If it's 30 or lower (as it optimumly would be) you would just sharpen the two different angles as individual blades. Should be able to get them just crazy sharp too. Unfortunately, I can't say for sure till we know what the factory bevel angle is. If you can find out, let me know. Thanks,
Ron