Answer:
The proper phrase is 'kink in the chain' which originated from the annoying predicament when a specific link of the chain of a bike, tricycle or any other type of chained vehicle causes it to turn in a disrupted motion. This can usually cause the chain to jump or skip due to this tiny inflexible kink. It is now used a little bit as a phrase referring to a small aspect of any kind of process or collaboration that slows everything and everyone down.