Push thru lamp sockets have solid brass shells and caps with set screws. Simple push thru sockets use standard medium base lamp bulbs. Brass replacement push thru sockets have simple push thru buttons to turn lamps on and off. Tapped 1/8 IP, fits standard lamp pipe.
Before making any changes to electrical fixtures and lamps:
Disconnect plug/wire from the electrical source.
Turning lamp off will not protect you from electric shock.
If you are unsure how to safely proceed contact a licensed electrician.