Single line reef, upgrade kit for 2 SLR reef. Complete kit. For Seldén B250 boom section (- 2008) Flange Half The BBB40 Fiddle Block features

The BBB40 Fiddle Block features a large 40 mm primary sheave and a smaller secondary sheave for increased mechanical advantage in rigging systems

An external 1:1 purchase heel lift system including a 405-001-17 cheek block and a 511-016 composite cleat

Learn how to use it:

OutDiam: 35

A Soft shackle is a Dyneema loop used for temporary attachments of lines

Single line reef, upgrade kit for 2 SLR reef. Complete kit. For Seldén B250 boom section (- 2008) Flange Half The BBB40 Fiddle Block featuresUpgrade from slab reef to the convenience of Single Line Reefing. This kit is for B250 booms made prior to 2008. Check the article number of your boom end (aft part). If it is 500 018 this is the right kit for your boom. Instant reefing with Single Line Reef Single Line Reef is made practical and reliable by Seldn. All you do is ease off the halyard to premarked reefing points and then haul in on the reefing line. The luff and the leech are reefed at