Well i have been at it again and this time it was the floor where i had taken a wall down. When i came to prepare to cut a plank to fit the gap first i had to prepare the gape in the floor. The floor was not straight and it's there i had to start. A straight cut on each side of the floor had to be made before i could cut the plank that was to fit into the gap on the floor.
Then i had to use an Acro prop to get both sides of the floor level. Then i had to sand down the floor each side of the gap to get the floor boards level as some had highlights and low spots. This picture was taken before the plank was tapped into it's final place.