J/30 Class Association Forums J/30 Marketplace Looking to Buy Something Need rebuilt mast Sheave Box K-10658 by Oct 1.

More background on the halyard box ... which is also used in one form or another on the j29 fractional ... with this J29 owner's report on how to send it out to be rehabbed for $800.

J29 rehab of halyard box



notice the top sheave is called the "spinnaker anti-sky sheave" ...