[Lynn H. Ogden]

Look at the data sheet for your Catalina 30 yacht and record the measurements: I; P; J; E; SAF; SAM; SAT; Fore stay length.
Search the Internet or read a book that teaches you what they are, what they mean, and how to use them.
Compare them to the measurements of a yacht mast you may want to search for on recycling offers or present them to a mast maker.
LO