The stone doesn't need reinforcement. I just need to way for the plaster to grip that inner surface in the hollow to right in the photo. the rest of the surface is good and sound.
I could really do with some expert advice how to proceed with this repair.
Below is a photo of a sandstone lintel over a basement door. Directly above it is the front door of the main building. The basement door effectively sits in the stair arch. The external steps were cement skimmed probably...
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