I've sharpened quite a few Sebenza's for others, and how i sharpen them is based on both personal experience and user feedback.
On older ones i've learned that the lowest angle i can reprofile them to lies around 35 degrees inclusive, and that i have to keep the edge finish rather coarse to still have quite good edge retention.
On newer ones i can lower the edge angle to around 30 degrees inclusive, and i also can refine the edge more, yet still have good edge retention.
Other people may have other ideas, but this is what i've found to work well.
Yesterday i did this regular Sebenza from 2005 in S30V steel, which is the favorite folder of a professional hunter.
The old factory edge was kept more or less sharp by him with stropping only, and the edge angle measured 35-40 degrees inclusive on the straight part and well over 40 degrees inclusive from the belly to the tip.
I reprofiled the edge to an even 35 degrees inclusive from heel to tip on my Rubber Wheel covered with 230 grit diamond powder (covered in wax to prevent any damage due to overheating), and only removed the burr with the Tormek leather wheel coated with 1 micron diamond compound.
This removes the burr gently but efficiently, while at the same time leaving the scratch pattern intact as much as possible to preserve bite (something i specifically aim for)
The Rubber Wheel has a tiny amount of "give" in it's surface which provides for an ever so slight convexity in the new edge, and the use of diamonds makes sure that the vanadium carbide particles in the steel are cleanly cut.
The resulting coarse edge both favors the S30V steel type and the actual use it will see in the hands of the hunter, and it's treetopping sharp with lots of bite.
No "before" pics this time (i forgot), but below are the result pics i also sent to the owner.
