I'm no engineer. Just a guess. The older models were not designed with vertical running rigging loads at the center of the cabin roof. There were horizontal loads leading from inside the mast to winches at the base of the mast
Later models had halyard, reefing, etc blocks attached to the cabin top that lead aft to the cockpit. These loads are vertical. In my untrained brain I always assumed that was the reason for the tangs on my 30 MKII and the lack of tangs on my 30 MKI But again, I'm no engineer Rob Gallagher Hanuman 30MKII Noank Ct
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