The reason there's no turnbuckle listed is that the vanguard 420 has variable mast rake, and uses a line which allows the mast rake angle to be changed easily, depending on wind strength and the weight of the bowman, etc... The dark purple line in this photo:
is the same line in this photo:
The white line and the steel cable are to temporarily hold up the mast until the headsail is raised, allowing you to set the mast rake and such while the headsail is down. The headsail has a wire luff and the boat doesn't have a normal headstay. It uses the wire luff of the sail instead of a normal forestay.
The 420 is not exactly a good boat for someone who doesn't have a lot of sailing experience, since it is a fairly high-performance racing dinghy.
If you don't know what you're doing on this boat, you're probably going to get yourself into a lot of trouble. I'd highly recommend you either find someone with some Club 420 experience to help you or that you get a different boat.
BTW, the Club 420 is designed to be sailed by TWO youths, and the boat's design weight is 260 lbs. It is designed for two youths to sail, and would probably not fare well with you on it, as it would be seriously overloaded. You weigh as much as the boat does. The boat is not ballasted and as such generally depends on one of the two crew to be out hiking on a trapeze to keep the boat upright. Sailing it by yourself will probably result in a lot of time in the water with a capsized boat.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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