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+[* black] I’ve spent another 10 minutes removing glue particles from surfaces, and used air blowing to remove most accidental particles traveled inside. As a result I cleared that huge dust particle under the rear glass, but it was hard process : )
+[* black] Alternative way to access inner glass surface of aperture chamber is to disassemble front area.
+[* black] I’m using double sided thick adhesive tape and empty frame from lens filter. Add tape pieces like shown on picture.

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