Ask the factory
Catalina can fax you the engineering drawing for the rigging types, sizes and lengths for your boat. Call them at 1-818-884-7700 and ask for technical support. I am replacing all ofthe runningrigging on my C-36, and have selected New England Ropes brand. They have a nice web site at www.neropes.com. I recently read in "Desireable and Undesireable Characteristics of Offshore Yachts" that a knot is preferred from halyard to shackle rather than an eye splice for several reasons including: the halyard can be easily changed end to end when it wears; an eyesplice and shackle, if hoisted into the sheave, can damage both. Caution, however, since knots can significantly weaken high-tech low-stretch ropes, and there may be specific recommendations in this regard from the maker.jv