I now have a number of videos on my SM Infosite of cavaliers with syringomyelia (SM). Videos are far better than description in trying to understand the symptoms of this condition and the various levels of severity.
You can view the clips here:
Clips 1 and 3 show moderate to more severe symptoms and behaviour in cavaliers. Clip 3 is particular informative on a range of behaviours. Clip 2 is of a severely affected cavalier and some may find it disturbing to watch.