Konica hexanon AR 21mm 2.8 query

[jamaeolus]

Got this at a cut rate due fungus, (which is visible in one of the photos below)320 usd all in. It's on th underside of the first element I was surprised by how small it is so I posted it next to the iconic Canon FL 50mm 1.4 for comparison. Haven't has a chance to try it yet. I was wondering if any of you have taken one of these apart? I got the name bezel off but the optical block doesn't seem to easily come out. If it is not really easy I will not mess with it. Anybody know a trustworthy lens tech? I don't like to take apart rare or valuable lenses, l leave that to the experts.



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A pic without the ID ring?