[turretslug]

The original glue did set hard- but was also quite brittle and crumbly anyway, so was likely to detach before the glass came to harm. I agree with the points made about using a glue with a degree of give in it- like Sideband, I've used Evostik successfully on relatively tepid-running signal valve bases. The trouble with a modern, hard-setting glue is that it will likely be less brittle than the original shellac goop, jeopardising the glass, and matching of expansion is a grey area.