Surfing the net, i found a PDF from a chinese patent, i can't read chinese but the chematics in this PDF look very similar to a chematic for a LNB with RT320M and single crystal.
https://patentimages.storage.g…cca8a520/CN206712931U.pdf
Not the best picture quality but readable
Maybe we can find a fix for a easier change of the LO?
vy73 DB8TF