Is this an Aluminum frame or steel? If it's Al, put the races in the
freezer for an hour or so, and heat the steering head with a heat gun
for a few minutes. The bearings will drop right in no pressing required.
Depending on the fit it might work with a steel frame as well. Depends
on which end of the tolerance the steering head bore is at, it's been a
50/50 experience for me.

Making a driver or puller is a pretty easy exercise if you have a
lathe. A top hat shape with a minor diameter that fits nicely to the
small diameter of the bearing and a major diameter a few thou smaller
than the OD of the bearing will do the job. As was mentioned by someone
else, don't make one that bears on the bearing surface.

With an eye to the future, take the time when the bearings are out to
file a couple of notches in the bottom of the bearing seat (in the
frame) so that removal next time will just take a long punch and a few
taps with a hammer to pop the race out.

Pete

--
Pete Snell
Department of Physics
Royal Military College

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All truths are easy to understand once they are discovered;
the point is to discover them.

Galileo Galilei (1564-1642)