The windlace over my doors keeps sagging in the middle. What is suppose to keep this in place? Would appreciate any suggestions to solve this problem.

The windlace itself is supposed to keep itself in place. The inner of it is a type of metal spring steel - best way I can describe it - that keeps it clamped along the pinch weld. You may try to add some glue to keep it in place and keep it from falling out of place.