We have them on the base of the mast on the newer F18's. 17 mm bolt tensions or loosens the settings. If you want a turn buckle Ronstan makes a nice one that is adjustable.
![[Linked Image]](http://www.ronstan.com/images/product/RF1574-0606.jpg)
http://www.ronstan.com/marine/product.asp?prodno=RF1575M0304I used the type above on my tiger and you can get it with a small arm so it is adjustable on the water.
This looks like a great replacement for the nuke proof turnbuckle that NACRA orginal put on.... Would this be that same for adding an additional tunrnuckle? Just looking for something to compensate for the rigging it self as they are never the same...
