This then is an up date to Charlie's post above?

"After reviewing the availablity of the orginal sheeve box and alternates As class measurer I recommend that the Rig rite sheeve box be approved for use only in replacement masts. Due to location differences and hole size it can not be retro fitted to old masts."

From the minutes, Chief Measurer's report....

• The Rig-Rite jib box assembly was recommended as an approved alternate to the original design that is no longer made. Rod commented that the location of the head stay attachment should be in the same position on the mast. Measurements will be taken of existing masts to confirm the dimensions.
• Charlie Stoddard to provide the final class rules wording for the changes above and post on the forum at least 30 days before the next BOG meeting so a formal vote can be taken.

Ok ... visual confirmation that the old box was used at least up to #505.

And here I was going to rebuild #526's here in NPT, and exchange for #505's in Oct. Yes, there was some kind of logic behind this discussion.

UNLESS of course 526 was a late replacement mast.

Interesting on how us OD'ers can take some of these things to the outer reaches.

OK ... I'm a little late on this ... at Marblehead NA forestay length with the new box did measure in OK on #526 ... so apparently the change at the factory to the new box took into consideration the OD max forestay length ...
[we had followed up with measurements with masts out, but I can't find that data anymore. ]