K-mount Cosinon-s 50mm easy to fix?

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Bushcat

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Joined
Jul 16, 2022
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134
Location
Tokyo
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35mm RF
I just rediscovered my old Pentax ME-F and a bunch of lenses. On the Cosinon-s 50mm, the aperture won't stop down and the lens rattles. Is this lens easy to open and, possibly, fix? I've searched for guides but maybe I missed something, so links would be great if there's no direct experience.
 
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