Maintenance notes for microscopes from Leitz' "white era" (160 mm tube length) Leitz Universal Condenser UK Leitz Dialux 20 Focus Control Leitz Diaplan and Aristoplan Condenser Holder and Focus Block Eyepiece Collimation of Leitz 160 mm TL Microscopes Leitz Laborlux and Dialux Condenser Holder and Focus Block Leitz Laborlux S Coaxial Focus Control Leitz Laborlux S Nosepiece and Head Mount Leitz Lamphouse LH 20 Leitz Trinocular Head FS/20 Leitz Laborlux D Coaxial Focus Control Leitz Mechanical Stage No. 90 Leitz Condenser No. 56 Leitz Universal Condenser UKL Leitz Trinocular Head FSA (cat. no. 512 815/20) Leitz EF 40 objective with stuck spring-loaded retraction Leitz Magnification Changer