$80.00?!!!! That sounds nuts! There are only 10 elements to the system: the two cleats afixed to the hulls, the four Harken micro bullet blocks, the covered steel cable, the two flat plates which afix to the jib car, some line and bungy.

If you have the plates, blocks and steel cable - the bungy and line can be had at any West Marine store, Lowes or Home Depot for 1/4th that! It's just about 35' of 1/4" line and 8' of bungy. Should run you no more than $20.

But to answer your last question - No. The 4-way jib adjuster works with the barberhauler and jib car placement to control the size of the slot between the main and jib. It's not necessary - you can attach the main jib blocks to the eyelet directly on the jib car if you want.

If you do use the 4-way system, this is how it's set: Moderate winds has the jib traveler car in the middle with the in/out jib adjustment 4-6 inches from the hull. As winds increase, move the 4-way adjuster for the block as close to the hull as you can. This opens up the slot and maximizes your speed. If the wind is light, bring the blocks in about 6 inches to reduce the slot. Set the jib car traveler (track on the hull) in the middle and as the wind picks up slide it back to the end of the track (15 knots plus). In light air slide the car forward.

Hope this helps.