That explains a lot, before starting the iroko i was thinking my hands had toughened up quite a bit, also explains why i am having such difficulty with the crook knives (on top of the sore hands), sounds like it is gonna be worth it as an iroko kuksa will stand up to a lifetime of use based on your description of it's properties.
Thanks for the info i now feel much less shame about not doing any more work on it today, i've been chopping and changing between doing the iroko kuksa and a seasoned zebrano spoon (for a rest lol) the zebrano is so hard i have had to sharpen my mora 120 three times with a dc4 starting on the sapphire side each time to remove the blade imperfections caused by pushing through the wood
The zebrano spoon so far
just need to hollow out the bowl and do some refined shaping with cloth abrasives