I cleaned my chimney cap today. Had lots of black buildup that was starting to restrict air flow. My wood wasn't quite as dry as I would have liked this winter. In the course of cleaning it, some of the welds that hold the top to the grate failed. This is the chimney cap I'm using. I was curious if I could use solder to secure the grate to the top. Should I just get a new cap? This is was new last August.