I would try a different mini adapter to see if it doesn't require backing out.
If it is the case that you need the optical cable not plugged in all the way, this could be a fairly volitile situation in the field. I would recommend creating a "stop" w/ a thin piece of electrical tape at the base of the mini adapter.
let me try this in ascii
before:
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___________
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W/ electrical tape stop **=electrical tape
------------- **
**_________
**
------------- **