I have a power drill and sometimes use it to make holes to put up hooks, etc. in my brick+plaster wall. But no matter how carefully I line the holes up and measure them, the hook always ends up at a crooked angle.
- Hold the hook against the wall
- Use a thin pencil to mark the two holes that need to be drilled for one hook
- Take the hook down
- Place the drill on the first mark
- Slowly drill a little way in, until I'm sure the hole is in the right place
- Drill all the way in, using the drill 'hammer' setting
- Put a raw plug in the hole, hammering it the last part of the way
- Place the hook back up, partly screw in one screw, and check that the 2nd mark is in the right place
- Take the hook down again and drill the second hole.
- Put the hook up and carefully screw both screws in
The hook will be mostly straight right until the last minute, when screwing the screws in for the last few millimetres will cause the hook to skew wildly to one side. Holding the hook firmly in place while screwing can improve it very slightly, but it's still not perfectly vertical.
What am I doing wrong?