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03-26-2018, 04:19 PM   #1
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modded and dismantled a SMC 40mm pancake and now I am stuck

Hey Guys I did a mode on the front element of the SMC 40mm Pentax 2.8 Asahi pancake but now I can't get the focus ring back together properly.

Is there any place I could find how this thing is assembled or how to put it back together? could not find anything online.

I know what order the parts go it and what direction but missing an element or have a step in the wrong order.... keep getting the helicoid stuck.

this is what I am looking at.

thank you for any help!

03-27-2018, 10:11 AM   #2
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I don't think it has the one you're looking for but there might be something close that could help you:
Pentax Lens Disassembly Database -
03-27-2018, 07:42 PM   #3
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I'm not seeing your photos and can't tell what the problem is. If you unscrewed the focus helicoid, the threads have multiple entry points. Only one point will get all the parts lined up in the right place for the lens to work properly. With a lot of patience, you can keep trying different solutions.

I should have a battered copy of this lens somewhere which may have parts. I don't think I've seen it in 10 years so I can't guarantee I can find it again. But I might be able to help further.
03-28-2018, 05:59 PM   #4
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Spent time looking how it worked and got it back together


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