The cheap solution
Cheapskate that I am, I examined all the options for several years, and found the cost excessive for what you get. The Harken kit seems to have the right idea, but it requires modifications to the sail cover and includes blocks that constantly chafe the mainsail. I installed a system similar in concept to the Harken system on the advice of Evans Starzinger (Beth Leonard's companion). When they circumnavigated their Shannon 38, a New Zealand sailmaker offered an inexpensive solution to the lazy jack problem that I have applied to my H-34.Install two small, cheap blocks on the second spreaders, about 1' out from the mast. Purchase two small (.5" to 1" dia.) stainless steel rings, 200' of small diameter braided nylon line, and two small plastic cleats. All available at West Marine.One end of a length (perhaps 30' - but you will have to experiment)of nylon line is tied to one side of the aft bail of the mainsheet, run through one of the stainless rings, and the other end to the forward mainsheet bail on the same side of the boom. A second length of nylon is tied to the ring and lead through the block on the second spreader and back to a point about half way between the forward bail of the mainsheet and the gooseneck. Install one of the cleats at this location and secure the line to the cleat. Repeat the process for the other side of the boom. Allow enough line so that the all of the lazyjack can be gathered and looped around the reefing hook at the gooseneck. Hence the lazyjacks can be gathered and removed just like the EZ Jack system. Before the main is hoisted, the lazy jacks are set (I usually do it at the dock) and tensioned. They can be left up while sailing, or removed for long passages so that they do not chafe the sail. I have found this unnecessary as the system is light enough (there are no blocks to chafe) that it has caused no problems. I have used this for about three years now, and have been satified with the results. The only down side may be the use of the light nylon braided line. It may chafe on the stainless rings, but I have seen no wear so far.This is a cheap, satisfactory solution to the problem that can be executed by and do-it-yourselfer. The biggest hassle is fasteneing the blocks to the second spreader. I did mine while the mast was down for other reasons.