Here's a tip I learned from a top club maker/repairman at the PGA Tour Store in Dallas, Texas.
I took my dad's steel-shafted Wilson Dyna Power 9 iron in to be re-shafted with graphite because I wanted it lighter. I use light clubs with a swing weight of about C9 to D0.
He said you don't need to do that. Just put on a larger grip and see what happens to the swing weight. I said OK and he installed a larger grip I pulled out of the rack and guess what happened. My dad's 9 iron went from a D4 swing weight to a C9 simply because with the larger grip, the weight was more evenly distributed. There may be more technically to it than that but that's the jist of it. Put on a larger grip if you want to reduce swing weight. (If you can live with a larger grip)
Dan O. De Ment
De Ment Marketing