Has anyone tried using a battery screwdriver to wind up an old
clock?

My mother has an old bracket clock that is now becoming too heavy for
her to wind - and I was surprised how long a wind it is too. My
thoughts were to get a replacement key and modify is to fit in the
driver chuck, but I would prefer to know the driver I have in mind has
enough torque before I start.

So a) has anyone done this ... and b) what simple methods for torque
measurement exist ?

Thanks
Rob