Shouldn't you ask the guy who made the mast! This year I used a saarberg mast but that had a variable control diamond tensioner fitted but the National Champ Chris Field just had the normal bottle screws. I can't be positive what the max tension would be for this particular mast but I think Chris was running with 38 on the new loose gauge but there again Saarberg masts are custom built to each individual customer as near as damit.