Good info for sure.
The 44t one that came with the bike was so easy to get on and balanced. This one has the large hole do it was more difficult to eyeball. I have no side to side wobble, but it bounces up and down. I rode it around and love the gearing but the up and down action is slowing me down. Im gonna tear it down again tomorrow and fix the movement.
I have regular lineat pull brakes and a non-disc hub, so I think the tophat is a no go for me. Just a rubber mallet and some patience to get her balanced better.