I've been looking for and finally found a 13* 3 wood 906 f2. It has the stock ultralight graphite shaft stiff. I tipped it almost an inch and it frequencied at I believe in the 275 cpm area, but the guy who measured it said it was around 290 or so. Bore through shafts play stiffer from what I remember in my club fitting class. My ony question is does that shaft now play as a tip stuff or is it more in the extra stuff range? I'm extra stuff all through my woods and irons. I'm looking for a nice affordable shaft for it in the mean time.