So I started noticing this problem on my Micra a couple of weeks ago. Over the past little while we got some almost tornado level rain here in the GTA and it got really bad really quickly. I decided to take it off and sure enough that metal bracket was absolutely knackered! I am in the process of doing a repair on this. On this type of thing (especially where water can get in and sit next to metal or paintwork as many of you know the paint and clearcoat on these cars is very thin) I like to go overboard and ensure the issue is %110 resolved. For those interested I will be posting a pretty in depth (and perhaps overly pedantic) overview of my repair.