I have a fairly large 8ft high sandstone wall, double faced with rubble fill and mostly mortar joints. A few stones have popped out of the wall and the shapes of these stones are not nice square or rectangle shapes that would be fairly routine to replace, they are more irregular shaped with the backs of these stones being more cone shaped.
Are there any clever methods or devices for holding irregular stones like these in place whilst the mortar sets, as they look like they will just fall out due to their weight before the mortar has a chance to hold them in place?
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