Best Angle for Benchmade Knife

[WrkWatchr]

I was given a Benchmade knife that has an edge that looks like someone used it to open cans and while I know they have a lifetime sharpening service available, I figure that since I have a T=7 with all the accessories, I should be able to do it myself. I tried to determine what the original angle was, but it is so narrow, I can't determine it correctly.  Any suggestions would be appreciated. It is a Benchmade Folding Knife with about a 5.5" blade (Partially serrated) but what I need to touch up is the regular knife edge part of the blade and get it back in new condition.

TIA

Roy

[Jeff Farris]

20 degrees on each side.