That's interesting. I wouldn't have though that Cannondale made a threaded AL steerer tube. What size head tube does your 1992 bike have? Measure the diameter of the stem quill. 7/8" means it has a 1" head tube, 1" means it's 1 1/8", 1 1/8" means it has a 1 1/4" head tube. These are nominal...