Threaded or threadless Headset/fork?
Threaded headset the bearing adjustment is taken care of
1" stem has a 22.2 MM OD, 7/8"; a 1.125" fork has a 1" 25.4mm ID
the difference is 1/8" diameter, or 1/16" radius.
so a tubular shim would have a 1" OD, 7/8" ID. 1/16" tube wall thickness
and have a slot cut in it , so as the wedge in the stem is expanded the sleeve will expand within the fork.
I have seen such pieces made, with a lip edge around the top so as to shoulder on top of your headset.
It is a relatively simple thing for a machinist to make, Chicago certainly has machine shops to do small jobs.
Last edited by fietsbob; 07-07-16 at 08:12 AM.