I bolted the dome ring
to the structure. Then I spent some time
adjusting the four casters that support the dome by means
of a strong, circular aluminum flange that is attached to
the dome and that rests on the four casters. Then I adjusted
the four casters that press outward to position the dome
laterally. Now that it’s
adjusted, level, and fully supported, the dome can be rotated
with the pressure of one finger.