Use swing speed as one guide, then consider tempo, transition, strike and flight. Flex labels vary, so compare a shaft that already works and the full model specification.
No. The adapter must be compatible and the finished length, weight and profile must suit the head. A club builder can change sleeves when the shaft tip remains sound.
Normal use does not gradually remove performance from a structurally sound shaft. Cracks, splintering, tip damage or poor heat treatment are the concerns. Cosmetic paint marks are different from fibre damage.
Choose a weight you can swing repeatedly while maintaining centre contact and awareness of the head. Lighter can add speed; heavier can improve timing. The useful range changes by club type.
Sometimes, after correct trimming and fitting. It may play firmer and the finished swing weight can change. Follow the shaft manufacturer’s trimming guidance.
Only when you understand tip preparation, adapters, epoxy, length and swing weight. Incorrect heat or cutting can weaken graphite. Professional installation protects the shaft and the club head.