M. A metal rod heated with a gas torch works better. N. If the screw is stripped and just spins when you turn it, put the tip of an old chisel under the edge of the head to ease it up. O. If it all goes wrong, try to get a hacksaw blade behind it to cut the screw. One friend of mine, when replacing several planks, made up a big dolly like this to stop the wood splitting as he drove out the screw heads. Note the hole in the other end to knock out the heads. P. If a screw head twists off and you need to replace it, you can file teeth on a metal tube and drill out around the screw. Q. Another trick is to use a 10mm drill bit to take out both the screw and the wood around it. Fill the hole with a standard plug and drill a new pilot hole for a new screw.