I reckon you could probably sharpen it with the corner/edge of a stone or any of the triangle-rod type sharpeners. It took some practice, but I've put the edge back on the package opener/gut hook/orange peeler from a Victorinox Executive.
Also jeweller's files work well for that kind of small surface.
Day 12, bottle opener flat tip screwdriver works great to pry batteries out of old clocks.
Day 12Only a few uses today. I did do a quick swap this morning to a SE blade to cut some hard crusted bread and then back to PE. It is going to be strange after this challenge to use a non-modular tool every now and then. I've been pretty happy with the Flex's modular design and it is up there with my favorite MTs.
Did use the Hook Blade again, and the small screw bits from Roxon to loosen the Plier Bolds a bit as the tools where to difficult to fold out Oh and its Day 12 (Douze)
Day 12I really like the ruler/file/driver tool. I wish other companies would go in on them. Vic and Leatherman both make a screwdriver/ruler, and a screwdriver/file, but not both.
matzesu, did the hook blade work well on the straps?