Golf Club Shafts: Steel Iron Shafts
just click on the shafts you want to check out and the info is there in one place.
For adding weight to increase swingweight
try thess is the shafts are not installed, they come in 2-4-6-8-10g weights
Golfsmith.com: Golfsmith Plug-Wates 8 Gram For Steel Shafts - Golfsmith
if the shafts are already installed you can remove the grips and add tungsten podwer and then ram a cork down the shaft to hold it in place.
Golfsmith.com: Golfsmith Iron Corks-Pkg/25 - Golfsmith Golfsmith.com: Golfsmith Tungsten Powder 1/2 Pound - Golfsmith
Just remember for every 2g of weight you add the head you increase the swing weight 1 point and soften the flex of the shaft by 1 cpm.