Lift the top edge of the door into the groove in the top rail. Then drop the bottom edge of the door into the groove in the bottom rail. The distance between the base of the grooves is greater than the height of the door.
That worked, should have asked two years ago. The top groove is much deeper than the bottom groove. I owe you all a beer.
@gav started
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Lift the top edge of the door into the groove in the top rail.
Then drop the bottom edge of the door into the groove in the bottom rail.
The distance between the base of the grooves is greater than the height of the door.