Hi,
  Forgive me if this is a dumb question, but where is the other end going?  The line coming from the slot should run to the back of the boom, the other down the side of the mast.  The topping lift should be tensioned enough to hold the boom 90 degrees to the mast, so that the mainsail rolls evenly into the mast slot.  That should prevent the lift line from getting tangled in the mainsail.  Given all that, it doesn't look right to me, I don't think mine runs from inside the slot at all, but I'll have to double check when I get to the boat tomorrow.

Peter

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