Seldén vernier shroud adjusters for dinghy and catamaran standing rigging, available in single-row and double-row versions in ø5mm and ø6mm for incremental rake and rig tension adjustment, with a de-raker plate for safe rake changes without disconnecting the shroud.
How to choose
A vernier shroud adjuster is a slotted plate that allows the effective length of the shroud to be changed by moving the clevis pin from hole to hole, giving indexed rake and rig tension adjustment without a rigging screw. Numbered holes allow settings to be recorded and replicated precisely.
The single vernier ø5mm (174-221-01) is the standard option for most dinghy applications. It has one row of holes with 9mm between adjustment positions and a radius base to match a U-bolt or eye-type chainplate.
The heavy-duty double vernier ø5mm (174-121-01) is the Mk2 version with two rows of holes giving 4mm between adjustment positions, which is more than twice the resolution of the single vernier. The thicker plate resists bending under higher loads, and the narrower overall width suits pressed or swaged eye terminals. A hole at the top of the adjuster can be used to retain a spinnaker halyard lacing hook or attach shockcord to support a spinnaker sheet ratchet block.
The heavy-duty single vernier ø6mm (174-219-01) suits higher-load and catamaran applications where a ø6mm clevis pin is required. It has 12.5mm between adjustment positions and a slotted front face for attaching additional fittings such as a cam cleat for catamaran jib sheets.
The de-raker plate (174-209) is an accessory that works with twin vernier adjusters to allow rake adjustment while keeping the shroud permanently attached to the boat. The shroud connects to the de-raker via a swaged fork, the de-raker is retained in the adjuster by a clevis pin, and rake is changed using detent pins in slots on the plate. This eliminates any risk of the mast falling when adjusting rake ashore or afloat. Note that the de-raker is not compatible with the Mk2 narrow adjuster (174-121-01).
Before adjusting shroud length or rig rake, confirm the correct settings with your class tuning guide or class association.
