Hi Skorj
A long time ago, I got a Polaroid 545 film holder with b&w film (can't remember the number.)
Since the film was really old, the pod would not burst properly through the rollers. I decided to use instead a steel roller from an old photocopy machine. By putting all my weight on the roller, I could spread the blob pretty evenly. It also had the effect of crunching the crystallized developper! If I remember (I don't know where I stuck those prints), the crystals produced an ice crystal like effect on some parts of the print.