Many inexpensive telescopes have an eyepiece extension that can be adjusted to prevent tilting.

Product Description
Many inexpensive telescopes have an adjustable focuser to prevent tilting.

These focusers have up to two grub screws that press against the focuser tube, guiding the tube. If this is adjusted precisely, the focuser will move a little tighter, but it won't tilt as much, and the eyepieces will be on the optical axis, resulting in a better image.

We adjust this on every telescope before shipping.
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