On Sep 24, 7:35*pm, jeff_wisnia
wrote:

Whatever had been holding it in place for about 60 years finally gave up
and let go. The remains of it in the recess are frangible and feel like
some sort of "plaster".


could have been grout.

Before WWI, melted Sulphur was used to attach Iron and Bronze
to stone, it expands as it cools, and seems last a _long_ time,
given examples are still attached.

But as others point out, Goop is the stuff for today, and my goto
choice.

**
mike
**