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Re: Lintel installation
Arches will support themselves after the mortar has set up. Until then supports (such as wooden forms cut to the shape of the arch) are used, or should be.
With the one pictured where a lintel is used I suspect it did not have a stiffleg support in place midway & sagged in the middle, causing the ends to bow up.
Wider door & window openings will also sag if not supported until the mortar has set.
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