I have a Smuggler N1954 'Magician' whose mast is also a d section proctor without spreaders, the rig tensioning is by a pair of shroud tensioners which are stainless levers on a quadrant rachet ( very similar in design to tensioners used on tiger moth aircraft ). I cant put pictures on the net but ther are photos of her and these tensioners on the Hornsea Sailing Club web site photo library. The rig tensioners were fitted in 1969 as far as I can tell by the second owner.