This was something I was meaning to post ages ago but forgot! I was stripping a section of roof before Christmas to add a new back gutter to a chimney when I realised I had forgotten my slate rip.
I managed to make a temporary one out of an old disposable hand saw. Cutting the to the side of the hanging hole on the saw to make a notch.
It's then just a case of slipping the "rip" between the slates and over the nail, hitting the handle downwards to pull the nail out (or snap the head off).
This doesn't last for too many slates, as the plastic on the handle can only take so many hits, but it meant that I could carry on working and strip an area big enough to carry on.
Anyone else made a temporary tool lately?