Newb Question
So I had a minor crash last weekend and my gear shifting was off. My bike wasn't really shifting correctly before the crash either but the problem became a lot worse after it. For instance, I couldn't ride is some gears at all. I noticed (see picture) that part A (no idea whats its called) was not flush with part B (again, no idea what this is called). I took the bike to the shop, and without really knowing what they were going to do, left them to fix it. When I picked up the bike I noticed that these two parts were in fact, now flush. I went out riding and now notice again that these two parts arent flush again - but my gears shifted fine.
What is going on here?