CV75/2.5 Heliar loose focussing ring

TMLee

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Apr 20, 2006
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The focussing barrel keeps unscrewing whenever I focus 'beyond' its limit.

What do I do to make it stay ?

Tried tightening but it still comes loose.
Is this a known QC problem? Googling throws up some remarks to imply that this is a known factory design weakness.

If glue is the solution, what should be the correct kind ?

Thanks in advance :)
 
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