What Happens
to the Mainsail Halyard Sheave?
Originally the main halyard sheave was attached to
the stainless steel ring at the top of the mast.
With the replacement of the ring by the mast band
the simplest way of attaching the sheave is for it
to share the same shackle as either the port or
starboard mast band shroud attachment points (or
tangs). In the adjacent photograph, the sheave is
shown attached to the port tang of the mast band
(the forestay is on the left, attached to the front
tang of the mast band).
It should be noted that on currently produced
Lugger masts a mainsail halyard sheave is not
attached to the mast band at all. Instead a slot is
cut through the mast just below the mast band to
accommodate a pulley for the mainsail halyard. The
advantage of this is that, when the mainsail is
hoisted, the gaff is pulled closer to the mast. It
would be possible, with care, to retro fit a pulley
by cutting a slot and drilling a hole for a
stainless bolt to act as an axle. This may be
featured as a future project. In the meantime, the
sheave attached to the mast band is equally
functional although care is needed when rigging to
ensure that the sheave is fastened on the inside of
the associated shroud.
(Click on image for larger view)
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