Lightest I had was an ITM Krystal with PMP bolt tuning package which at 120mm long weighed 183gram. I'm guessing that a quill adapter and stem are going to come in heavier .. a quick google shows Genetic Alloy Quill to Ahead Stem Converter at 230g plus 100g for a tunned Syntace F99 would give you 330g ..
Replacing the quill screw with a Ti one from PMP will take a bit of weight off both those quill stems
http://www.pmpbike.net/pmp-bike-en/?product=t-005-vite
Lightest I had was an ITM Krystal with PMP bolt tuning package which at 120mm long weighed 183gram. I'm guessing that a quill adapter and stem are going to come in heavier .. a quick google shows Genetic Alloy Quill to Ahead Stem Converter at 230g plus 100g for a tunned Syntace F99 would give you 330g ..
Also have a look at this .. http://velospace.org/node/6214 .. the build may give you some ideas?