Rob has run his tack reef line in the manner suggested by Ed Botterell (Botts) in his booklet "Nonsuch thots By Botts". You can find the booklet on the INA member's site (you have to sign in) under Members/Sailing a Nonsuch-Guidance. I recommend you give the booklet a read. It answers many of the questions raised in this discussion thread. Starting at the mast you tie the tack line to one of the eyes on the mast collar ( we will assume port side. I suggest using a bowline with a half hitch to keep the bowline from opening under pressure. The loop of the bowline should be small. The one in Rob's picture looks good but as mentioned I would add a half hitch, I have had bowlines slip until the line pulled out. run the tack line up through the reef crinkle to the starboard side and immediately back to the port side and through the turning block. This way the cringle is not at the top of the stack of the sail slides.
If you are having trouble getting enough halyard tension with the full sail up, adding a Cunningham can be helpful. If the problem occurs when you are reefed, Ed had a suggestion. When reefing haul in the tack reef line until it is almost fully down, then hardened the halyard as hard as you can. Then put the tack reef line around a winch and winch it down a bit. This should provide the tension needed.
At page 3 of Nonsuch thots , Note C, Ed suggests the clew "Somewhere near a foot above the wishbone is optimum." This depends a bit on the cut of the sail. It is important to remember that there is considerable variety in how the sails are cut and that they stretch with age. The numbers given are approximations.
A few points to keep in mind. It is very difficult to lift the boom on the topping lift when there is tension on the halyard. You have to bend the top of the mast with the topping lift to do it. It is also very hard to lift the back of the boom using the reef line. It is much easier to lift with the topping lift. With those thoughts in mind, i use the following sequence then reefing:
1. Turn the boat and ease the main sheet until I have taken pressure off the sail and the sail is centered over the boom. If the sail is not over the boom it can fall outside and it become difficult to pull in the leech cringle.
2. Ease the choker and harden the topping lift (note you can wait to harden the topping lift until after the tack and halyard are adjusted)
3. Ease the halyard and pull in the tack reef line. Lock the tack line and really harden the halyard (see the note above about halyard tension)
4. Lift the boom with the topping lift if not done in step two. Pull in the leech reef line until the cringle is about 1 foot above the boom (remember this number is approximate)
5. Ease the topping lift, harden the choker. It should be hard. You are reefing because the wind is strong so you want a fairly flat sail. When hard on the wind you will likely want the sail just kissing the boom or not touch it at all. (again an approximation)
6 Choose your point of sail and adjust the mainsheet accordingly.
That is the order i use. You can try something else if you like but as Joe says do not harden the choker unless and until the halyard is fully hardened.
Mark Powers