I have a cheap Seiko 5 SNKL07K1 (7S26-03T0) which I absolutely love.
Is it possible to swap the movement for a 6R15/NE15 to give hacking and hand-winding functionality - i.e. will the movement, crown stem, second hand pinion, etc. all fit in the case and under the existing crystal?
I might also want to swap the white second hand for a silver hand, and add a sapphire crystal at the same time.
Has anyone done something like this?