The spelling of the phrase "butt shaft" is quite straightforward when using the International Phonetic Alphabet (IPA) to explain. The first syllable, "butt," is spelled as /bʌt/, with a short "u" sound and a hard "t" at the end. The second syllable, "shaft," is spelled as /ʃæft/, with a "sh" sound at the beginning and a short "a" sound followed by a "f" and a "t" sound. Together, this phrase refers to the handle of a golf club or other tool, and is commonly used in sports and machinery contexts.