How do I ground my LED retrofit in a ceiling can?
Warranty? For 3), cut the ring connector. Don't cut a hunk out, just split it. Use dykes. Then you can bend it (like a key ring spreads) around the bolt and when you tighten it, it will flatten out again as a ring and won't fall off. But that's not the most secure place to connect (i.e., the height adjustment screws don't tighten very tight). Any other location for securing this connection to the can is probably a better choice (e.g., for 2), use self-tapping screw next to the hole that's too large).