We assemble  IOM rigs for the D4 boats

Mast   We use the high tensile 11mm French built mast section . This is pre bent 15mm

Stays  we use .55mm single stand Marlin wire that stays straight

How to insert stays into mast video

Spreaders  adjustable spreaders made with rigging screws

Gooseneck Vang Variable Geometry We find this very effective to get correct downwind settings 

Fittings  mostly sail setc 

Main and Jib  booms We use sail sect booms and fittings