oh, yes sorry
forgot there are no haptic displays on mobiles yet
You have to be blindfolded to dismantle a gun?
hmm, guess You'll have to invent a blindfolded picture download drill
acoustic signals maybe?
oh, now I understand - when my last mobilephone's display screen was wrecked, I had to use it for 2 weeks blind until I got a new one, performing all the routines from memory - how's that one, drill sarge?