Silver Tair -11 fixing problem

[Drack]

Hello to all,

A few days ago I was asked to fix an old Tair- 11 lens. Or its focusing part , to be exact. The owner tried to disassemble the whole focusing part, however he broke almost everything and now I do not know what to do, how to fix the problem.
Ok , so here we go. My objective is to remove the lens mounting part from the focusing helical part , however I cannot do that because it is jammed. The owner has tired to unscrew the bolts ( red mark NO. 1 ) , but failed and they broke. Then he dried to drill them out , however the drill broke and he simply left the 2 screws that didn`t come out slightly drilled. Then he removes the screw ( red mark No2 ) and the mounting ( silver) part started to move around. If I screw it back , the focus jammes , if I turn it to the right it does one whole spin and then jammes and does the same to the focusing helical, same thing happens if I turn it to the left.






I`ve tried forcing it out , I`ve tried pulling it but I`m running out of options here. I do not want to damage the lens more than it is already ,however I don`t see a way out. Can anyone give some advice on how to remove the mounting part please.

Thanks.

[mmelvis]

Left handed drill bit source
http://www.mcmaster.com/#left-hand-drill-bits/=gunzdv

Set the drill motor to reverse and carefully get the left hand drill bit started in the center of the broken screw. To center the drill bit get a piece of brass tubing from a hobby shop to use as a drill guide. Cut a piece that fits into the hole and leave about 1/4 inch sticking out.

[kapnobatai]

Hello, I know this is a very old thread but as I can t find other resources, maybe you guys can help me out. I dissasemblied my Tair11 up to this point Drack has made the picture but I don t know how to proceed further. My screws are intact, they came out easily, but I don t know what s next. Any help would be greatly appreciated, many thanks

UPDATE: The black ring finally came of, maybe because I sprayed wd40 in te screw holes and on the hread edge, maybe not, but it moved, all ok, sorry for the annoyance