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(see pictures for example)
The flat side of the block is specially designed to sit against the mast of an optimist to stop any twisting
A2021SC and all double and triple variations
The Aerovane features a built-in counterweight which ensures accurate indication of apparent wind angle
Only use a non-crossed Tii-Shackle on low-load applications
Allen 20mm Dynamic Triple Block with Cleat and Becket Apparel & Personal Gear (see pictures for example)Allen 20mm Dynamic Triple Block with Cleat and Becket
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