Joe, your eyesight is a lot better than mine. For the life of me, I cannot see where the teeth are broken in the gear in the lower right of the photo.
As for the camstack, I have read a lot of complaints about broken ones. All I know is that I have seen some that I thought were broken on first sight, that turned out not to be when all other parts were cleaned and lubed. I don't claim to know what the follower does or does not track for each stitch without testing it out. As for glueing, I'm not sure I'm following what Joe is saying; I'm sure that in person you could point it out in a second. There are a few limitations to e-communications, eh?
I do agree that for a $5 investment, you can afford to experiment a bit. One owner who had a camstack problem just kept it as a straight stitch machine and was happy with that.