It probably falls under the same reason why so many 'old school' people still believe putt for dough, drive for show: Pure stubbornness. As @brocks has mentioned Jack got it all going with his moving the goal posts and apparently at that time he just had his way. And some of the guys here just can't let that 'Major wins' thing go despite it being shown quite clearly that 15>18. And I wouldn't doubt that despite Jack himself admitting the superior fields these days he'll hold on to that 18 as long as he can as the sole determining factor of greatness.
Thank for the feedback guys! Yeah, from what I could find out they were the 1986 model. Not much else out there. Foam filled with brass inserts. I will probably pull the 2 iron (that I will never even attempt to hit, lol). Taking them out for a spin in the AM. Regripped 4-pw with Pure DTX in green, in honor of the 5th green jacket! Got to go to my 1st PGA tournament ever last Sunday...what a day that was!
That is your body talking to you. I had the same experience some 25 years ago. I would suggest you listen to it and stay off the weights. I do not know how old you are but at about 50 most people start to feel the effects of the tight muscles from the heavy lifting.
If you are preparing the body for golf and life, you are far better off using exercises that are dynamic in nature and build strength by creating muscle integration instead of muscle isolation. You need to keep the muscles lengthened around the back not tightened. That will only cause you more problems down the line, but I would imagine you already know that. You could also have used inversion therapy to lengthen the muscles in the back and create more separation between the vertebrae . That might not be advisable anymore. Good Luck. .
I play the Titleist ProV1. It's one of the longest balls out there but that's not why I use it. I use it for the way it feels on my putter face. It feels like I can put a good roll on it. It just happens to bite with irons and drives well. I am a short hitter and a 5 HDCP age 63.