<https://stargazerslounge.com/topic/82057-low-profile-focuser/#comment-800288>
<http://schema.org/text>
"Either solution would work, but the first one is a bit pointless (unless, of course, you have some stuff that only works without the extension tube, in which case the second solution won't work). \n"
<https://stargazerslounge.com/topic/82057-low-profile-focuser/>