Empty chamber indicator

I am fortunate in having access to an up to 50 yd indoor that accepts airgun owners. I shoot primarily a Vet .25 ,a Royale in .22 and a Crossman 1701P. I have been using a very small zip tie as an empty chamber indicator but worry I could damage the breach o-ring or possibly the transfer port due to the hard irregular nature of the zip tie. Wondering what everyone else is using. Range masters are very versatile.
 
It depends on your range I guess. Mine is pretty informal and other shooters are fine when in I tell them it's an air rifle, I have no empty chamber indicator, but it's safe. Larger clubs or public ranges are more stringent, and some range officers enjoy their power position and can be confrontational. But if I had to use one, I'd probably use a double length of fly line, or something like the string trimmer line recommended above.
 
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Small disposal ear plugs. Just clip the string.

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