might look into this part...
this is a thread on another forum where someone used it... seems to be a cleaner way if you go wth the extender method... knock the star nut out and it turns into a quill type internal stem but still use your normal 1 1/8 spacers and stem... you can have up to 80 sticking out on top of your steerer tube or less if you want... neat system IMHO
http://www.retrobike.co.uk/forum/vie...p?f=1&t=235105
http://bbbcycling.com/bike-parts/headset-parts/BHP-21
http://www.wiggle.com/bbb-bhp-2021-stem-extender/