You should be able to place the eyepiece before cleaning the mixer. Check that you've done the following:
Go to the ovoids and turn to the face.
See that the magenta gas is over flowing now under the green gas.
Use the recently made plain bottle on the magenta gas to get colored gas in bottle.
Place the colored gas in bottle on the end of the mixer.
Now there are cyan, magenta and yellow bottles attached to the setup.
Place the violet bottle underneath the large glass
Place the eyepiece on the metal arm above the large glass.
Look through the eyepiece and see that it has decomposed tissue in there.
Press the red button to pass UV light on the setup and sterilize it.
