Today it was easy. I'd chipped out the concrete edge yesterday and had the cap about 70% broken off. Today I used Sawzall to go around the rim circular and just when I was wondering what's next the old thread popped out all in one piece.

Straightened out a couple of female threads, pipe doped the male and a light ring on female just for hell of it. Screwed in easy enough and the level is perfect. Again, thanks for the tips.

I'm glad it worked out well for you!

Just needed a little "persuading". Glad it worked out.