On Friday, August 1, 2014 8:12:41 PM UTC-7, Ed Pawlowski wrote:

In a perfect world. . .

If you are removing screws above you, you can defy gravity and push "up"
to get the screws out.

Yeah, there IS a screw head design that allows you to pull. The
screw has a dovetail slot, curved so the driver can be positioned
at one edge and rocked into the slot. This scheme is not
compatible with magnet-held hex shank bits.