The boom vang I have has blocks similar to these from Garhauer:
?	Attached to the (2) 6" x 1.5" straps with 1/2"grommets at each end
<https://www.lowes.com/pd/Stanley-12-Pack-1-2-Grommet-Kit/3033681> , which
are attached to the 3/8-16 x 4.5 mast bolt is: 
<https://www.garhauermarine.com/fiddle-block-with-cam-cleat-and-shackle-25-05-us.html>
?	Attached to the boom bale (I used different, but this is cheaper and
should work):  <https://www.garhauermarine.com/boom-bale-bb-2.html> which is
through bolted. 
?	The top block is similar to:
<https://www.garhauermarine.com/fiddle-block-with-cam-cleat-and-shackle-25-05-us.html>
This block does not come with a snap shackle, but other manufacturers may. 
Garhaur is very accommodating about modifying their equipment and will
probably add a snap shackle if requested.  
I used 5/16" line for the 3:1 purchase, which (like the blocks) I had lying
around. Since the vang can only be used with the pop top down and can also
be used as a preventer by having a third double grommet-ed strap which wraps
around the cabin top hand rail - having the snap shackles on both ends is a
real convenience.
Many thanks to all the R22-ers on this forum from whom I have borrowed
heavily!





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Jeff Smith
2009 R22 #101 RADIANT
Atlantic Highlands Municpal Harbor
Atlantic Highlands, NJ

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