There are quite a few "high temp" glues available, JB Weld makes one.
I usually just solder the plate cap and quit while I am ahead.
k4che

On 3/29/2025 8:41 PM, Glenn Little WB4UIV wrote:

What is a good glue to put a grid/plate cap back on a tube?
Also for reattaching the base to a tube.

Thanks
Glenn