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A sheave box can also be fitted to the mast to meet the 5–10° requirement. A sheave box will
not damage the halyard nor is it worn by it either. Installation is more complicated but the box will
eliminate the need to replace halyard leads in the future, as mentioned above.
When manufacturing Seldén masts, a sheave box is usally incorporated if a Furlex is to be used.
Sheave box kits with fitting instructions are available from all Furlex dealers.
See also table 5.2.1 and fig. 5.2.a for further information.
If the boat is equipped with a spinnaker halyard, this must be kept clear of the Furlex system to avoid
halyard wrap. An effective solution is to lead the halyard around the upper shroud and then aft of the
spreaders.
Stowing a spinnaker halyard parallel to the Furlex stay is not recommended!
10.2 Halyard sheave box
10.3 Spinnaker halyard