This thread has great pointers on tags. I would recommend your aluminum and sourcing some used wire (copper electric wire) to go with it as @SkillCult has suggested and used successfully. This is the free and simple solution I plan to use. Just make sure you twist the wire tight against the tag so the wind doesn’t rub the hole bigger and eventually cause the tag to fall off. I’ll be engraving mine since I have thicker aluminum scrap.
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