"If a job's worth doing........"

Marlane's saying, relating to me, comes up time and time again.
"If a job's worth doing, it's worth doing twice"! Today it was putting the door handles back onto the bedroom and en-suite doors.
Can you spot the deliberate mistake?
I didn't notice until I was locating the third screw ready for applying the screwdriver. It could have been worse, I could have tightened them all up and then noticed!
Note to self: Must pay more attention!