#help

Hello, I'm working on my uncles Stihl MS 271 and when I got it all torn down I found the the transfer cover had come off the head. Now my question is can I reattach this some how or do I need a whole new head for it ?? I have never seen this happen so I figured I'd ask you guys/gals who are...

Thank you anyone who is willing to help, This avocado tree is about 4 years old from seed and has always had the problem of leaves turning brown and falling off, it also has leaves turn black (looks burnt). The brown spots either take the tip/edge first or they just start in the center and...