Most microscope eyepieces will contain a threaded ring in the
bottom that can
be removed, allowing the reticle to be placed inside the
bottom of the eyepiece, and then screwed back in place securing the reticle.
However, occasionally the eyepiece will not include a ring, or the
ring may have been lost. In that case, the user can either glue
the reticle in place with a small amount of silicon rubber or
clear nail polish. Or you may purchase a c-ring which can be
inserted after the reticle is in place holding it securely. To
order, please check the box to the left of the desired c-ring below,
and then click the "Add to Cart" button at the bottom of the page.