Sorry if this has been asked and answered before but I couldn't find anything when searching. Anyway I just got my first TLR, a Yashica 24 in very nice condition, but noticed something when moving the focusing wheel: the entire lens-mount(lens-plate, lens-board?) tilts left or right (depending on whether or not I'm focusing closer or farther away). The tilt is quite noticeable, maybe a degree or more each way. Now obviously this has me concerned, but the strange thing is that the first roll of film I ran through it looked fine. No noticeable light fall off or focus issues at the edges of the print. So my questions are: is this normal? Can this be repaired (is it worth it?) Or should I even worry about it?