I have an ancient RK-2 that came out of a local studio that had been around since the 70s and closed about 10 years ago. Since I got it right around the time I began handbuilding, I haven't thrown on it much, but whenever I did it kinda drove me nuts and I was never sure if it was me out of practice or the wheel. After reading this thread I took a 360 digital "bubble" level to it and discovered that the wheelhead is actually closer to being level than any other surface I checked in my house. Teeny tiny bit of vertical wobble. However the old plastibats which came along with it are a hoot. Some of them knock horribly (worn holes) and the few that actually sit pretty tight on the batt pins are definitely not centered on the wheel head - so I have to ignore the edges of the bat while I throw.