Thanks for the exemplification. When I (and my brothers) had Focal 10-30x zoom 30mm telescopes back in the mid seventies, we would sometimes remove our scope's eyepiece and extend it back with a tube made from a slit and then rolled up paper towel roll wrapped with a rubber band. I think we obtained up to about a hundred power, as we termed it (100x magnification). I used to extend the eyepieces on the microscope my mom got from my grandpa's estate, too. I think I increased that up to a max 10x more magnification than stock.