Turnbuckles may simply be replaced with new or the old ones may be inspected, cleaned, refinished and returned to service. At $25 each it's an easy decision. ( There are 10 turnbuckles in a Taylorcraft!)
When you disassemble the turnbuckles the first thing you'll notice is that one end has left hand threads. That end is marked with a ring around the barrel. The turnbuckles may be difficult to turn, soak them overnight in a penetrating oil. Once you have them disassembled, clean all parts with a toothbrush and mineral spirits.
The barrels are made of bronze and are likely to have turned a dull gray color. You can return them to a beautiful golden hue with a scotchbrite pad and some metal polish. (Photo 2). Clean the internal threads by screwing an old turnbuckle end in and out a few times with a drop of marvel mystery oil.
Turnbuckle ends are galvanized steel. If the plateing is intact you may simply clean and reuse them. But you're likely to find that most have a light surface rust starting. (deeply rusted, pitted ends should be rejected) Give them a light bead blasting to remove the rust and a double coat of epoxy primer. (don't paint the threads!)
Small parts like turnbuckle ends may be blasted in a kitchen strainer like shown in Photo 3 or they may be attached to a board for blasting and painting like Photo 4. I prefer mounting them to a board since it protects the threads from blasting and painting.
AC43.13 shows how to assemble and safety wire your turnbuckles.
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