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Many models have
thumbscrews around the
Focusing Tube to tighten the
eyepiece down. Even if there
aren't any, they are probably
not needed.
Put the 20 mm eyepiece
into the Focusing Tube.
If you do not have a
20mm eyepiece, use the
highest number eyepiece
you do have. The
eyepiece looks like this.
(It will say 20mm on the
top of the eyepiece.)
898
23
22
21
20
19
18
190-200-210-220-230-
13
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