my audio-optical input doesn't fit good on my tv in order to connect to my home theatre

Solution
Since the optical connections isn't electrical the plastic piece doesn't really need to be tight. So long as it works it's OK to use tape to keep it from falling out.
You could try a different cable which might fit tighter.

rodfuller1631

Prominent
Sep 20, 2017
2
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510
that's all it was I used some tape and it was fine. Thank you very much!