I am interested in the TS-1 irons with the KBS Tour 105 shafts. Swingweight calculator estimates it would pan out to be C-8 at standard length with a 50 gram grip. That is so light. D-2 is what I would prefer. By my estimate, 8 grams would have to be added to the tip to achieve this. That seems like a lot, and I’m curious if that much weight in the tip will pull the center of gravity from the center of the club (which is a big premise of Malby’s playability theory), to the heel-side of the club…effectively working against the playability of the club?
Also…why are the clubheads so light? Even with full weighted Dynamic Gold shafts at 130 grams…it estimates out at D0, which is truly a light swingweight for a “players” club.
10 gram tip weights will only move the cg approximately .070″. So 8 grams will be slightly less. That is an insignificant amount and will not affect playability. We don’t consider the head weights light. 252g to 254g for a # 5 iron has always been the “standard” range for us. Not sure what length you making it and what grip weight your using, which will effect the swing weight number. I have built clubs for “players” for years and I would say D0-D3 is pretty much the norm. Never cared much what the number was, just that the club had the right head feel for the player, and most of the “players” I have worked with went by the feel not the number. Adding 8 grams is truly not an issue and if the number needs to be D2, I wouldn’t hesitate to add the weight.