Articulated hinge for RV or caravan roof vent

This amazing hinge is self locking if installed properly, or, can be locked in any position using the hand-screw. Print one of each stl files except
rwhatchcurved2x1..stl, which has to be printed twice.
Three different lengths included, choose accordingly.
All of them prints well without support.
Assemble using M4 screws or 5/32 inch diameter of at least 30mm length.
Best is 2 x 30mm and 1 x 35mm for the hand screw.
Easy and convenient to use.
FreeCAD source included for easy editing.