Wow! I love it when people pass on advice. Thanks. Some times the skin can cause problems if left at the top. I make sure it is not embedded in the chrysalis. And, I do exactly what you said. I spray with water to soften the skin and gently pull it off. Usually the pupae wiggles and wiggles to dislodge the skin after it attaches the cremaster to the silk button, but some times it doesn't fall off. That skin actually stays attached to the prolegs until the cremaster makes that long reach up to attach to the silk button.
Herndon, VA (USA)
Take care of the small things....