Shim, 20 x 370 x 58 mm, for Mast Jack System D80/400 BBB40 The System 42 Double sheave/becket

The System 42 Double sheave/becket End Control is designed for high performance jib/genoa trim with 4:1 purchase

Seldén supplies complete lazyjack kits with all the necessary blocks

Optional adaptor plates with threaded and anodised holes for the Seldén S-winch are available

Max line size: 18 mm

this is the solution

Shim, 20 x 370 x 58 mm, for Mast Jack System D80/400 BBB40 The System 42 Double sheave/becket20 mm thick aluminium mast jack shim. Pump up the mast, place shims below T base and mast heel and release pressure. Read all about Seldns mast jack systems on our website. https: support. seldenmast. com files 1723731359 597 107 E. pdf