At Superpedestrian we have been working recently to diagnose some problems we have seen with one of the seals we use on the Copenhagen Wheels.  Using my camera stand and a ring light, I took a high-resolution photograph of a suspect seal so that we could use available software to perform critical measurements (a poor man’s optical comparator).  The most tricky bit of this setup was ensuring that the camera sensor plane was dead parallel to the seal.  I also made a set of images with my flatbed scanner which offered higher resolution at the expense of 7 minutes per side scan time.