Fixing a stiff aperture and focus ring on pentax-a 50mm 1.7 ??

Started May 3, 2013 | Discussions thread
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Fixing a stiff aperture and focus ring on pentax-a 50mm 1.7 ??
May 3, 2013

I got a legacy lens for my sony nex-3n, the lens is in good condition everything is clean inside... BUT the focus and aperture rings are somewhat stiff, its still very useable, but when i'm trying to really focus precisely it can be a bit annoying.

Going from around f4 to f.17 it gets progressively harder to precisely turn the aperture ring. Same for the focus ring, it is smooth most of the time except towards the end when there is more friction...
Can I try to put a tiny bit of lube in between the rings? I have some lube called Tri-Flow , it's clear colored. I also have some WD-40 ... I was thinking maybe using like a dental floss string and dip it in lube and then pass the string in between the rings ?... i dunno... obviously im a total noob

 Louno's gear list:Louno's gear list
Sony Alpha NEX-3N Sony E 50mm F1.8 OSS Sony E 16-50mm F3.5-5.6 PZ OSS +1 more
Sony Alpha NEX-3N
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