Changing filter wheels takes about 5 mintues. Putting the telescope along the meridian
at about 0° Dec allows easy access to the filter wheel box, which has four small hex
screws on the cover. It lifts up and slides down along its guide rails.
Carefully unscrew the thumbscrew in the center of the wheel. Lift the filter wheel up
along the telescope axis.
When putting a wheel in, use a flashlight to find the two pins that guide it. There is
only one position that works for the two pins and the thumbscrew. Reassemble the cover.
Obviously, treat the filters very carefully. Fingerprints are not considered good manners.
Blow away dust with compressed air.