I originally designed, manufactured, and sold the non-rotating adjustable eyeiece holders for the AP/Baader/Zeiss binocular viewer and kept two sets for my personal use and would like to now sell my extra set. These custom made eyepiece holders are meant to replace the original fixed eyepiece holders and allows you to adjust each eye separately in case your eyes are different, or even if there is a small difference in your eyepieces. They also allow you to use the longer-barreled eyepieces like the TeleVue Radians in the binocular viewer. They were manufactured by an engineering firm that made the sample collector that will be flying to Mars on an upcoming mission so you can know that they do very fine work.
The two sets that I kept for myself for myself are extremely smooth in operation. I have two close up pictures and could send these if requested. I am selling my one spare set to try to off-set the cost of two ZAO's that I recently purchased. These holders are non-rotating which means that the eyepiece will go up and down without rotating or turning. These sets will probably not be made again, and and the cost is the same $450 that I sold all of the other ones for. This includes packaging and shipping, etc. Complete installation instructions will be included along with the 2 required allen wrenches and all necessary mounting screws. These holders were specifically designed to only work in the AP/Baader binocualr viewers and the older Zeiss models of identical design.