Originally Posted by
PromptCritical
You could also have framebuilder braze an insert into the fork so the steerer tube where the handlebar stem connects is a standard 1-1/8". There is a recent thread here on BF where someone mentioned a cost effective builder that does this.
... which would mean removing the cannondale suspension fork completely...
if changing the fork to a 1 1/8" steerer becomes a choice, it would be much easier to just buy The ADAPTER HEADSET KITS that are commercially available.... i've installed two in ten years time....
the kits come in 1 1/8" straight, or modern-tapered.
the tough thing to find is the 1 1/4" to 1 1/8" kits.... there's one installed in my M600 Cannondale. and it let me install the Marzocchi Bomber Superfly fork i found, in Excellent condition, for $15...

the colors even match fairly well.... the bike is dressed in STX dark chrome, including the stx parallelogram hubs, cranks and rings... that bike has a "not really for sale " price on it.. for now....