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

Interesting .... this is the only available replacement as far as we know. and is what is on 526. it seems to have a number of options ... but not as far as the two spin sheaves? go directly to the attachment link for a better readable copy.



now what makes this a bit more interesting this is the "old" box on 505 ... note the line about the pin 1 in. higher on the mast.



prior discussion on this move of pin suggested that when they did make the change they did lower the box 1" so that the forestay length would be same, same.

See related thread at related thread on boxes here