To bust some of the myths and misconceptions being repeated in this thread, here's the straight truth for typical pool shots using typical pool equipment:
A wood/carbon-fiber/LD shaft cannot put more spin on the CB.
A hard/soft playing-cue tip cannot put more spin on the CB.
A rounder tip cannot put more spin on the CB.
Big massé shots are different, where a very stiff shaft on a short and heavy cue with soft tip can help.
Many supporting resources dispelling the myths and misconceptions can be found here: