Shaft-Snap Rings and Shaft Crowns

Shaft-snap rings and shaft crowns are used with nylon shafts, and keep the flights tightened to the shaft. 

Often when you started to get the grouping right and the 180's is all up in there, the flights bounces of the shaft. With snap rings /crowns the flight will stay mounted on the shaft.

Some players use glue on the flights when they mount it to the nylon shafts, this is a good solution to keep the flights on the shafts, but it can be a bit expensive because you have to replace the shaft and the flights if any part gets broken.