Shroud T-ball keeper
I'm sure most of us have experienced a shroud dropping out while raising the mast. Keith of hull 1124 saved me this frustration by sharing his idea of using a short piece of Nite Ize gear tie. You need around a 5" to 6" piece cut from the stock length. Just stick one end in each of the side shroud holed after inserting the T-ball connector. They seem to have a core then does not corrode and don't fall out while sailing.
Gear Tie® Reusable Rubber Twist Tie™ (niteize.com)
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A trick used by several California Weta skippers is to use foam earplugs pushed into the mast opening after installing the T-ball connector. Simple, reusable, dirt cheap and ubiquitous, it works very well.