That’s weird. I used to have the same knife and I was able to sharpen the entire bevel. The knife does have a sharpening choil which should aid in doing so. Maybe you could reposition the knife in the clamp so that you can reach the choil area?
This is a common problem though with some Spyderco knives. Grinding the plastic off the handles of the stones is one solution. Another solution (which I employed) is to make a sharpening choil with a round diamond file. If nothing else works, you may be able to enlarge the sharpening choil of the 940 using a round diamond file (or perhaps a Dremel).
Success and let us know how you fared!
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