You can buy a good handle here.
How to change a lock on a screen door.
Remove the old handle and screen door latch unscrew both interior latch mounting screws pull the interior and exterior handles apart and remove the center spindle.
The spindle should project through the inside of the door a maximum of 1 2 and min of 1 4.
Window companies change their parts over the years and often the parts used by your windows become unavailable.
In some cases door latch plate mortises might need to be cut or enlarged.
This allows you to pull the door knobs off the door from both sides.
Discard the old handle.
Cylinder will then pull out.
Insert the deadbolt spindle from the inside through the center hole into the key lock.
Screen door locks and latches are usually the kind of parts that you really need but no one seems to have the right part.
The splines are pieces of narrow rubber tubing that keep the screen secure around the door frame.
Did you lose the key somewhere near your house and now you are worrying that perso.
Once the new pins are in reverse the steps to reassemble the lock.
Begin by removing the screws from the door knob on the interior side of your door.
Pull the splines out of the door frame groove with steady firm pressure.
This video is how to install a screen door handle on a standard screen door.
There is a separate piece of spline for each side of the screen.
Remove the two screws from the latch plate on the edge of the door and remove the latch from the opening.
To do this when door is open you will need to press the deadlatching pin which sits above the main latch next you will need to undo the cylinder retaining screw then insert and turn key to lock position.
On the other hand some parts have not changed in forty years.
As with the handle you may need to cut your spindle to suit your door thickness.
Use an awl or your screwdriver to pry up the spline at the corner of the frame.
Insert the pins and reassemble the lock dump out the old pins insert the new key and use tweezers or small needle nose pliers to match the new colored pins to the color code on the special instruction sheet.
Learn how to replace or change the security door lock under three minutes.