The Golfworks women’s standard lengths chart shows the recommended length for the 28 degree hybrid M890 as 37.5″ for graphite and 38″ for steel — is this correct? I’m thinking of building the club 1/2″ shorter than recommended by using the 14 gram weight in place of the standard 8 gram, with the M890 LL shaft and a 39 gram undersize grip. When you build this club to the standard configuration with a club pak, using that shaft and an undersize grip, what swingweight do you get? I want to build the club shorter, but I hope to keep the swingweight at at least C5 or higher. Thanks.
Based n the information you gave, at 37.5″ with the 252 gram head weight of the 28 deg. head and the grip weight at 39 grams, my calculator tells me the swing weight will be around C5. So, if you make it shorter by 1/2″ and do nothing to the head weight the swing weight would drop by approximately 3 points to C2. That would mean by replacing the 8 gram with the 14 gram weight you should be back to the C5 swing weight. So, based on the numbers, you should be at C5 at the 1/2″ shorter length. However, my experience is that you better allow for a variance. My guess is it might be more like C4. When you cut a really lightweight shaft shorter, the effect on swing weight sometimes varies from the formula a little. If C5 is the key number, maybe cut only 1/4″ shorter and use the 14 gram weight and see where you stand. You can always cut more.