The remaining eight bearings, four on
the top track shaft and four on the bottom
are mounted on eccentric axle and may
need occasional adjusting.
Loosen the set screw which locks the
bearing axle. With a screwdriver, turn the
axle so that bearing just touches the
chrome track shaft.
Re-tighten the locking set screw. The
bearing should just touch the track shaft
and slip when turned. Not all bearings will
be in full contact with the track shaft over
its full length.