Hi Mike. Another microscope Mike here in Japan. Sadly a NIKON TDM Diaphot was discarded last week from the labs. Ive been picking up Olympus BH2 s recently. I have disassembled the Diaphot and am now repairing and maintaining it.What an amzing beast it is. I have removed the prisms etc and am having trouble with the sliders. Thx for your advice I have suffused brass sliders with acetone and have released one. I think your TMD is great. Total Microscope Domination.lol.