The new Top Climbers have a pin you can pull and clamp the ascenders anywhere you want. Etienne was selling the new hardware at Oakland show last year for those who already have the older Top Climber. I use my main halyard to climb the mast. I don't like metal fittings on the end of halyards so use a Bowline to bend on the halyard to the sail. With external halyards, you can fit the Top Climber to the tail end even with hardware spliced on the sail end.