Older house built in the late 60's. Trying to remove existing Halo (new work?) recessed fixture completely to retrofit and extend circuit to one more fixture. I removed the 4 screws (well there were only 3) and the can comes down about 1/2" to a fairly hard stop that feels metallic in nature. Any thoughts ?
With the power off, try pushing the can up into the attic. The can should break free of the bracket and only be held in place by the cable. Some of these lights have support ties that attach to the joists. Once the can is free of the bracket, you should be able to look up there and see how the fixture is fastened in place. good luck and stay safe out there.