Buick 1998 Riviera Owner's Manual page 233

9. Replace the wheel nuts
with the rounded end of
the nuts toward the
wheel. Tighten each nut
by hand until the wheel
is held against the hub.
If a nut cannot be tightened by hand, use the wrench
and see your dealer right away.
10. Lower the vehicle by rotating the wheel wrench to
the left. Lower the jack completely.