Hi again,
I found a photo I annotated for someone else which you may find useful- the green piece to repair the inner sill is first, it’s vertical with a 90 degree bend in the end of it. The red piece is next, up against the green piece and cut to the right shape for the curve of the inner arch. Then the blue piece last.
I make the pieces out of cardboard first, then cut them in steel. Greetings cards are excellent for this...
Cheers
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