Rubber car tube. Stretched tight over length of scope. Can be flicked off with one hand. Doubles up as a fire lighter if needed. Go to a tyre repair shop. They'll give you an old tube.
Rubber car tube. Stretched tight over length of scope. Can be flicked off with one hand. Doubles up as a fire lighter if needed. Go to a tyre repair shop. They'll give you an old tube.
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