Replacing recessed cans difficulty?

[OWC Jamie]

If the connections are tight and the bulb is good then check the center tab in the E26 socket (light bulb socket ). Sometimes that center tab isn't very springy, needs to be pulled back out and sometimes it is also carboned up from a loose connection making the poor connection worse. Tabbed Center connect should be hot, so power off unless you have tools for working on 110AC live.