Before putting the screen door back in check to see if the rollers can be pushed up into the screen door frames.
Usually they have springs attached to them which push the rollers back out when you try to push them into the screen door frame.
If they wont move, there is usually an adjusting screw you have to loosen. One for each roller. It's often located near the bottom of the frame. You will see an open hole big enough to stick a phillips screwdriver inside.
Some screen doors have adjusting screws that can be plainly seen sticking out of the frame above the roller. These often get rusty and break off when you try to adjust them. Other times a little squirt of penetrating oil or WD40 can loosen them and make them work again
It's best to check the roller adjustment screws before getting the rescreening done because if there are any problems with them, the frame may have to be taken apart to install new parts.
With the screws loosened and rollers free to move up and down a little, there is usually enough room to push each roller over the bottom track when you try to reinstall the door.
After reinstalling the door you will need to tighten the adjusting screws back in, to raise the door up so it glides nicely. By adjusting each of the two bottom rollers, you can also get the door to sit perfectly square in the frame.
