My old Nacra 5.5 had a spin with an internal tack line rigged up. If I recall, the exit hole was on the side of the pole, at about the 3 O'clock possition looking forward from the tramp, about 18" forward of the inboard end of the pole, and the tack line then went directly to a small Harken cam clete on the front beam.

Mine was rigged up with a 2-1 inside the pole which I do NOT recommemd because it was always getting twisted up inside the pole where you couldn't get to it while sailing. It would jam up, usually when the spinnaker was -half way- out.