kj wrote:
I was doing a routine lightbulb replacement in the recessed ceiling
fixture in my entrance hallway when the top of the bulb sheared
off cleanly from the threaded metal part. Great.

Brainstorm.....duck tape. Stick that fits the bulb base. Wrap end of
stick with bunch of duck tape, sticky side out. Press into unpowered
light base, press, twist. Could work.