I have a kludge , made possible with a tube steel stem raiser ... A wedge in the tube is at the bottom, is in the fork's inside diameter 7/8"

it flares out midway up to be the same outside diameter as the rest of the fork steerer..

Being a hollow tube, up top , makes using a star nut in it and bypassing the thread, a non threaded headset of 1" type can be used .

spacers a shim under a 9//8" stem can be used .. then the headset is adjustable with the top cap bolt ..


If the threaded headset/fork steerer is still fine, Adaptor is a simpler solid piece machined 7/8" at the bottom.
and 9/8" on the top , and then a stem can be attached directly. headset isstill intact..



Somewhat confused since in the 80's the Expedition was their Touring bike model like Trek's 520. now its apparently a Hybrid.