Adding lead to your club can make you hit it straighter and more consistently,so why not every pro on every tour does it.
Surely it would be better if their club manufacturers got it right with all their technology. Fact is the pro's probably tweak the clubs themselves, without even thinking about S/W.
Bob, I don't want to be pedantic about this but swingweight is a personal thing.
The reason I fired up, is someone felt they needed a more wieldy driver and they wanted to shorten it and asked, would it be ok to take 1" off the butt end. I and others said yes, with the caveat that there could be a perceived weight (heft) difference.
You then implied that it was essential to restore the OEM swingweight
. . . my question is WHY?
Perhaps less heft will suit the individual and enable them to control the club better - even swing a little faster perhaps - and with a potentially faster swingspeed the last thing you need is to soften the shaft by weighting up the head.