Does the P19 have threaded plates molded in the hulls for the gudgeons? All the other Performance Cats (Nacra, Inter) have nuts and big washers (through drilled aluminum plates) that are loose on the inside of the hulls. Nothing is actually tapped and/or molded in the hull for the gudgeons so the hulls just have through holes.

You've checked to make sure there are not nuts on the inside right?