runswithsizzers
Subscriber
You can see how the ALZO camera bracket works at <this link>. The silver bumps around the camera mounting bolt (at the 12 o'clock, 6 o'clock, and 9 o'clock positions) are the ends of adjustment screws which push against the bottom of the camera. It takes a few minutes to remove the bracket, make adjustments, replace the bracket - then check alignment (and repeat if more adjustments are needed). The 12 and 6 o'clock screws can be used to compensate for front-to-back 'play' that would otherwise allow the camera to sag out of parallel alignment to the copy stand base. You also have to manually align the camera parallel in the left-to-right dimension by rotating the camera on the tripod bolt. I use a bulls eye spirit level placed on the back of my camera to help with alignment, but that only works if your negative holder is level as well. Another way is to use a mirror at the negative position, and eyeball the alignment through the camera viewfinder. Aligning the camera parallel with the negative is a little bit fussy, but workable.