How could I fix a stone or reconstituted stone block approx ten inches by 4 inches by one inch thick, with a carved dedication on one side, to an Ancaster stone church wall?
It would need to be vandal-proof.
Mirror plates are ugly and will show and rust if steel, if the screws are stainless steel they will show bright for evermore. Small brass mirror plates could easily be hand-made but that still leaves the screw problem.
Could the supporting stone wall be chiselled reasonably flat and a modern adhesive used between plaque and wall?
The supporting wall is of a crumbly sedimentary stone so perhaps an intermediate thin perforated (for the adhesive to anchor to) brass plate, Rawlplugged to the wall then a modern adhesive between the plate and the back of the plaque?
If that was successful it would be for life!
Advice, please, and thanks.