 The mast, built by Reynolds, was aluminium alloy with the top section made from spruce.A number of modifications have been made to the class over the years including construction in GRP from 1968, and the introduction of a one piece rotating mast by Proctors in 1970.Despite the introduction of plastics to replace ply moulded boats, it is a testament to their build quality that there are still many wooden boats racing regularly.