I did this with my old single speed. I had put the freewheel on slightly crooked and fucked up my hub. It didn't click though. I'd take it off and make sure you put it on straight, that is if you didn't cross thread it already like I did.
On another note, just finished up my grocery getter. Coaster brakes, huge ass leather saddle, and split baskets on the back. It's sickening how heavy this thing is. The rear wheel outweighs my road bike.
Lastly, I got a cleat fitting to take care of my knee problems. They lowered my seat and pushed my cleats forward which felt a lot better. Since my right leg is so much shorter than my left they told me there weren't enough shims in the world to fix my problem and my best bet is to build up the foot bed inside my shoe. I got some inserts in there now and I'll take a ride tomorrow to see how it feels. Considering my knee is starting to get back to 100%
Sorry for the long ass post.