To use the Chakmak, hold the knife in a point down position with the edge in a comfortable, accessable position (I put the edge away from my body. Don't want to gut/castrate myself if it slips.). It's easier if the tip spine section of the blade is sitting on a workbench top or a similar surface that may get marked. An off cut of fence paling, chopping block or something is good for that too. Then just like you are using a stone to sharpen the knife, angle the Chakmak to the bevel/edge. You can use the flat of the Chakmak for polishing (like a strop) or if the edge needs a little more aggression, you can tilt the Chakmak to run the sharper corner edge down the blade. Personally, I just use a small fine diamond hone to up-keep the edge, solely because I am more comfortable with that. But it's always nice to know you can use the Chakmak if you need to.
My big Khukuri knife equates to either 3rd or 4th issue...4th issue...Just pulled up the website to check for differences . Our modern, water buffalo handled Khukuries are called 'Service Number One' (you're correct), which has got to give you an insight into the importance placed on the Khukuri by their true Ghurkha users.


Mick