The aperture blades was Loose so could not close down to f/22 and the shutter blades was not working very good, and the slow gear was not working correct on 1 second in this old YashicaMat with a CopalMXV shutter and a Yashinon 1:3.5 f=80mm.

it was not a big problem to disassemble this camera and the shutter, then clean the shutter blades and the aperture blades with Isopropylalcohol 99%. A few things to remember, is to set a mark on the back of the aperture control ring, before disassemble and also remember how the shutter blades and the aperture blades was sitting

The real problem was to put the 10 aperture blades back into the shutter, it takes SO MUCH longer than I expected it, so I speed up the process in the video. But it turn out to be a BIG SUCCES.

Then I also taken out the slow gear because 1. second was way toooo long, because of old sticky oil or dirt, I clean it in Isopropylalcohol 99% and then lube the axle ends ONLY! with very fine, and very little sewing machine oil, and then everything works perfect again