I'm trying to remove 1 decking plank to access a blocked drain underneath. The decking was installed about 6 months ago (not by myself). The screws appear to have been countersunk far below the surface and the holes look something like:
I'm using a 9V cordless drill with variable torque settings to try and get these up. I'm using a PZ2 bit with a drill bit extender. I've managed to get some of these up but most of them just aren't moving and I'm very concerned about stripping the screw heads. I've also tried using a manual screwdriver with little luck
The screws when removed look like:
Which shows even for the easy ones I'm starting to strip them. My question is, how on earth do I go about removing the other screws? Also, how have the screws been sunk so far?