Yes I was too dumb. I read over internet that mirror slip could be fixed by heating by hair dryer. Yes it does help but after a week, it re slips again. So this time I put a little, too much, super glue but it was a mistake. It leaked and blocked the window where photodiode reads so focus confirm didn't work so to remove the super glue, I heated back. And yes it liquifies
but then a drop to the shutter blades...oh man... Ok I cleaned my mess gently by the help of acetone. I removed the mirror and scrub the glue off by acetone. And put new double sided tapes. So I think all works now but... The focusing screen was deformed due to the heat. So I need a new one. Ebay has a couple but not the type I want, matt disc.
In short do you know if any cheap Yashica models have focusing screen that can fit? Or do you have any unused rx around?
P.s.It is officially under the name, Contax Focusing screen FW type