Reply by fredf

some times you can use a small punch tangent to the head to spin it around, sounds like you had it loose. another trick is to use a drop of super glue to lock driver into the slot (espc for a cammed out philips, but should work on a slot also. I have also heard that dab of valve grinding compound will improve grip, the abrasive digs into the side of the slot and the screwdriver

Keep your screwdriver tips undamaged, A worn tip creates lotsa headaches!

-- Fred, Springfield, Ma